diff --git a/.github/workflows/general.yml b/.github/workflows/general.yml
index da2f835..e417859 100644
--- a/.github/workflows/general.yml
+++ b/.github/workflows/general.yml
@@ -9,6 +9,11 @@ jobs:
   test:
     name: Test
     runs-on: ubuntu-latest
+    services:
+      postgres:
+        image: postgres
+        ports:
+          - 5432:5432
     steps:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
@@ -16,6 +21,11 @@ jobs:
           profile: minimal
           toolchain: stable
           override: true
+      - name: Migrate database
+        run: |
+          sudo apt-get install libpq-dev -y
+          cargo install --version=0.1.0-beta.1 sqlx-cli --no-default-features --features postgres
+          SKIP_DOCKER=true cd chapter03-1 && ./scripts/init_db.sh
       - uses: actions-rs/cargo@v1
         with:
           command: test
@@ -39,6 +49,11 @@ jobs:
   clippy:
     name: Clippy
     runs-on: ubuntu-latest
+    services:
+      postgres:
+        image: postgres
+        ports:
+          - 5432:5432
     steps:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
@@ -47,6 +62,11 @@ jobs:
           toolchain: stable
           override: true
       - run: rustup component add clippy
+      - name: Migrate database
+        run: |
+          sudo apt-get install libpq-dev -y
+          cargo install --version=0.1.0-beta.1 sqlx-cli --no-default-features --features postgres
+          SKIP_DOCKER=true cd chapter03-1 && ./scripts/init_db.sh
       - uses: actions-rs/cargo@v1
         with:
           command: clippy
@@ -55,6 +75,11 @@ jobs:
   coverage:
     name: Code coverage
     runs-on: ubuntu-latest
+    services:
+      postgres:
+        image: postgres
+        ports:
+          - 5432:5432
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
@@ -65,6 +90,12 @@ jobs:
           toolchain: stable
           override: true
 
+      - name: Migrate database
+        run: |
+          sudo apt-get install libpq-dev -y
+          cargo install --version=0.1.0-beta.1 sqlx-cli --no-default-features --features postgres
+          SKIP_DOCKER=true cd chapter03-1 && ./scripts/init_db.sh
+
       - name: Run cargo-tarpaulin
         uses: actions-rs/tarpaulin@v0.1
         with:
diff --git a/Cargo.lock b/Cargo.lock
index 93d8898..d3d5a5e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -258,6 +258,11 @@ name = "adler"
 version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "ahash"
+version = "0.3.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "aho-corasick"
 version = "0.7.13"
@@ -266,11 +271,21 @@ dependencies = [
  "memchr 2.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "anyhow"
+version = "1.0.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "arc-swap"
 version = "0.4.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "arrayvec"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "async-trait"
 version = "0.1.38"
@@ -281,6 +296,14 @@ dependencies = [
  "syn 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "atoi"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "num-traits 0.2.12 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "autocfg"
 version = "1.0.1"
@@ -336,6 +359,14 @@ name = "bitflags"
 version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "block-buffer"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "generic-array 0.14.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "brotli-sys"
 version = "0.3.2"
@@ -354,6 +385,11 @@ dependencies = [
  "libc 0.2.76 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "build_const"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "bumpalo"
 version = "3.4.0"
@@ -400,6 +436,19 @@ dependencies = [
 [[package]]
 name = "chapter03-1"
 version = "0.1.0"
+dependencies = [
+ "actix-rt 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "actix-web 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "anyhow 1.0.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "chrono 0.4.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "config 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "reqwest 0.10.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.115 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.57 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sqlx 0.4.0-beta.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.2.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "uuid 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
 name = "chrono"
@@ -419,6 +468,17 @@ dependencies = [
  "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "config"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "nom 5.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.115 (registry+https://github.com/rust-lang/crates.io-index)",
+ "yaml-rust 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "copyless"
 version = "0.1.5"
@@ -438,6 +498,19 @@ name = "core-foundation-sys"
 version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "cpuid-bool"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "crc"
+version = "1.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "build_const 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "crc32fast"
 version = "1.2.0"
@@ -446,6 +519,44 @@ dependencies = [
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "crossbeam-channel"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-queue"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "maybe-uninit 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-utils"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "autocfg 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crypto-mac"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "generic-array 0.14.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "subtle 2.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "derive_more"
 version = "0.99.9"
@@ -456,6 +567,19 @@ dependencies = [
  "syn 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "digest"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "generic-array 0.14.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "dotenv"
+version = "0.15.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "dtoa"
 version = "0.4.6"
@@ -642,6 +766,15 @@ dependencies = [
  "byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "generic-array"
+version = "0.14.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "typenum 1.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "version_check 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "getrandom"
 version = "0.1.14"
@@ -680,6 +813,7 @@ name = "hashbrown"
 version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
+ "ahash 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "autocfg 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -699,6 +833,20 @@ dependencies = [
  "libc 0.2.76 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "hex"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "hmac"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crypto-mac 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "hostname"
 version = "0.3.1"
@@ -848,6 +996,18 @@ name = "lazy_static"
 version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "lexical-core"
+version = "0.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "arrayvec 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ryu 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "static_assertions 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "libc"
 version = "0.2.76"
@@ -882,6 +1042,11 @@ dependencies = [
  "linked-hash-map 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "maplit"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "match_cfg"
 version = "0.1.0"
@@ -892,6 +1057,21 @@ name = "matches"
 version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "maybe-uninit"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "md-5"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "block-buffer 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "opaque-debug 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "memchr"
 version = "2.3.3"
@@ -985,6 +1165,16 @@ dependencies = [
  "winapi 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "nom"
+version = "5.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "lexical-core 0.7.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "version_check 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "num-integer"
 version = "0.1.43"
@@ -1021,6 +1211,11 @@ name = "once_cell"
 version = "1.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "opaque-debug"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "openssl"
 version = "0.10.30"
@@ -1239,6 +1434,7 @@ dependencies = [
  "percent-encoding 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "pin-project-lite 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.115 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.57 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_urlencoded 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio 0.2.22 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-tls 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1342,11 +1538,35 @@ dependencies = [
  "url 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "sha-1"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "block-buffer 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cpuid-bool 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "opaque-debug 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "sha1"
 version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "sha2"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "block-buffer 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cpuid-bool 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "opaque-debug 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "signal-hook-registry"
 version = "1.2.1"
@@ -1377,6 +1597,117 @@ dependencies = [
  "winapi 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "sqlformat"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "maplit 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "sqlx"
+version = "0.4.0-beta.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "sqlx-core 0.4.0-beta.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sqlx-macros 0.4.0-beta.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "sqlx-core"
+version = "0.4.0-beta.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "atoi 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "base64 0.12.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "chrono 0.4.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crc 1.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-channel 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-queue 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "either 1.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-channel 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-util 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hashbrown 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hex 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hmac 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "itoa 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.76 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lru-cache 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "md-5 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "once_cell 1.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "percent-encoding 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha-1 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha2 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sqlformat 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sqlx-rt 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "stringprep 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "thiserror 1.0.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "uuid 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "whoami 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "sqlx-macros"
+version = "0.4.0-beta.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "dotenv 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "either 1.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "heck 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha2 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sqlx-core 0.4.0-beta.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sqlx-rt 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "sqlx-rt"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "native-tls 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "once_cell 1.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.2.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-native-tls 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
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+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
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+version = "2.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
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@@ -1411,6 +1742,24 @@ dependencies = [
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 ]
 
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
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+
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+ "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "thread_local"
 version = "1.0.1"
@@ -1455,12 +1804,33 @@ dependencies = [
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  "mio-uds 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num_cpus 1.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
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  "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-macros 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
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+[[package]]
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+version = "0.2.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
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+ "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
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+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+ "tokio 0.2.22 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
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 version = "0.3.1"
@@ -1561,6 +1931,11 @@ name = "try-lock"
 version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
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+version = "1.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
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 version = "2.6.0"
@@ -1605,6 +1980,14 @@ dependencies = [
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 ]
 
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+dependencies = [
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+]
+
 [[package]]
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 version = "0.2.10"
@@ -1700,6 +2083,11 @@ dependencies = [
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 ]
 
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
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@@ -1759,6 +2147,14 @@ dependencies = [
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 ]
 
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+dependencies = [
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 "checksum num_cpus 1.13.0 (registry+https://github.com/rust-lang/crates.io-index)" = "05499f3756671c15885fee9034446956fff3f243d6077b91e5767df161f766b3"
 "checksum object 0.20.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1ab52be62400ca80aa00285d25253d7f7c437b7375c4de678f5405d3afe82ca5"
 "checksum once_cell 1.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "260e51e7efe62b592207e9e13a68e43692a7a279171d6ba57abd208bf23645ad"
+"checksum opaque-debug 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
 "checksum openssl 0.10.30 (registry+https://github.com/rust-lang/crates.io-index)" = "8d575eff3665419f9b83678ff2815858ad9d11567e082f5ac1814baba4e2bcb4"
 "checksum openssl-probe 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "77af24da69f9d9341038eba93a073b1fdaaa1b788221b00a69bce9e762cb32de"
 "checksum openssl-sys 0.9.58 (registry+https://github.com/rust-lang/crates.io-index)" = "a842db4709b604f0fe5d1170ae3565899be2ad3d9cbc72dedc789ac0511f78de"
@@ -1903,19 +2323,33 @@ dependencies = [
 "checksum serde_derive 1.0.115 (registry+https://github.com/rust-lang/crates.io-index)" = "609feed1d0a73cc36a0182a840a9b37b4a82f0b1150369f0536a9e3f2a31dc48"
 "checksum serde_json 1.0.57 (registry+https://github.com/rust-lang/crates.io-index)" = "164eacbdb13512ec2745fb09d51fd5b22b0d65ed294a1dcf7285a360c80a675c"
 "checksum serde_urlencoded 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "9ec5d77e2d4c73717816afac02670d5c4f534ea95ed430442cad02e7a6e32c97"
+"checksum sha-1 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)" = "170a36ea86c864a3f16dd2687712dd6646f7019f301e57537c7f4dc9f5916770"
 "checksum sha1 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2579985fda508104f7587689507983eadd6a6e84dd35d6d115361f530916fa0d"
+"checksum sha2 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2933378ddfeda7ea26f48c555bdad8bb446bf8a3d17832dc83e380d444cfb8c1"
 "checksum signal-hook-registry 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "a3e12110bc539e657a646068aaf5eb5b63af9d0c1f7b29c97113fad80e15f035"
 "checksum slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c111b5bd5695e56cffe5129854aa230b39c93a305372fdbb2668ca2394eea9f8"
 "checksum smallvec 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "fbee7696b84bbf3d89a1c2eccff0850e3047ed46bfcd2e92c29a2d074d57e252"
 "checksum socket2 0.3.12 (registry+https://github.com/rust-lang/crates.io-index)" = "03088793f677dce356f3ccc2edb1b314ad191ab702a5de3faf49304f7e104918"
+"checksum sqlformat 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5ce64a4576e1720a2e511bf3ccdb8c0f6cfed0fc265bcbaa0bd369485e02c631"
+"checksum sqlx 0.4.0-beta.1 (registry+https://github.com/rust-lang/crates.io-index)" = "8cb7b012f28c74075d6b11172ba1874f4376a255509462eaf2ef25068b31729f"
+"checksum sqlx-core 0.4.0-beta.1 (registry+https://github.com/rust-lang/crates.io-index)" = "fe2857d90b39b8528948109abc1b8d4c1905d184c87deaf06055f0b21050f13e"
+"checksum sqlx-macros 0.4.0-beta.1 (registry+https://github.com/rust-lang/crates.io-index)" = "6d1bc862e5f4484965156c224f7e4c139f2d3c65b6aa0e3ae8c63461831b8da9"
+"checksum sqlx-rt 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "23f9104f6116b568358f315e9839ae66c4ebbc0e974db5580105f0acfeb4863f"
+"checksum static_assertions 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
+"checksum stringprep 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "8ee348cb74b87454fff4b551cbf727025810a004f88aeacae7f85b87f4e9a1c1"
+"checksum subtle 2.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "502d53007c02d7605a05df1c1a73ee436952781653da5d0bf57ad608f66932c1"
 "checksum syn 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)" = "891d8d6567fe7c7f8835a3a98af4208f3846fba258c1bc3c31d6e506239f11f9"
 "checksum synstructure 0.12.4 (registry+https://github.com/rust-lang/crates.io-index)" = "b834f2d66f734cb897113e34aaff2f1ab4719ca946f9a7358dba8f8064148701"
 "checksum tempfile 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6e24d9338a0a5be79593e2fa15a648add6138caa803e2d5bc782c371732ca9"
+"checksum thiserror 1.0.20 (registry+https://github.com/rust-lang/crates.io-index)" = "7dfdd070ccd8ccb78f4ad66bf1982dc37f620ef696c6b5028fe2ed83dd3d0d08"
+"checksum thiserror-impl 1.0.20 (registry+https://github.com/rust-lang/crates.io-index)" = "bd80fc12f73063ac132ac92aceea36734f04a1d93c1240c6944e23a3b8841793"
 "checksum thread_local 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d40c6d1b69745a6ec6fb1ca717914848da4b44ae29d9b3080cbee91d72a69b14"
 "checksum threadpool 1.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d050e60b33d41c19108b32cea32164033a9013fe3b46cbd4457559bfbf77afaa"
 "checksum time 0.1.43 (registry+https://github.com/rust-lang/crates.io-index)" = "ca8a50ef2360fbd1eeb0ecd46795a87a19024eb4b53c5dc916ca1fd95fe62438"
 "checksum tinyvec 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "238ce071d267c5710f9d31451efec16c5ee22de34df17cc05e56cbc92e967117"
 "checksum tokio 0.2.22 (registry+https://github.com/rust-lang/crates.io-index)" = "5d34ca54d84bf2b5b4d7d31e901a8464f7b60ac145a284fba25ceb801f2ddccd"
+"checksum tokio-macros 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)" = "f0c3acc6aa564495a0f2e1d59fab677cd7f81a19994cfc7f3ad0e64301560389"
+"checksum tokio-native-tls 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "cd608593a919a8e05a7d1fc6df885e40f6a88d3a70a3a7eff23ff27964eda069"
 "checksum tokio-tls 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "9a70f4fcd7b3b24fb194f837560168208f669ca8cb70d0c4b862944452396343"
 "checksum tokio-util 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "571da51182ec208780505a32528fc5512a8fe1443ab960b3f2f3ef093cd16930"
 "checksum tokio-util 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "be8242891f2b6cbef26a2d7e8605133c2c554cd35b3e4948ea892d6d68436499"
@@ -1925,12 +2359,14 @@ dependencies = [
 "checksum trust-dns-proto 0.18.0-alpha.2 (registry+https://github.com/rust-lang/crates.io-index)" = "2a7f3a2ab8a919f5eca52a468866a67ed7d3efa265d48a652a9a3452272b413f"
 "checksum trust-dns-resolver 0.18.0-alpha.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6f90b1502b226f8b2514c6d5b37bafa8c200d7ca4102d57dc36ee0f3b7a04a2f"
 "checksum try-lock 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "59547bce71d9c38b83d9c0e92b6066c4253371f15005def0c30d9657f50c7642"
+"checksum typenum 1.12.0 (registry+https://github.com/rust-lang/crates.io-index)" = "373c8a200f9e67a0c95e62a4f52fbf80c23b4381c05a17845531982fa99e6b33"
 "checksum unicase 2.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "50f37be617794602aabbeee0be4f259dc1778fabe05e2d67ee8f79326d5cb4f6"
 "checksum unicode-bidi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "49f2bd0c6468a8230e1db229cff8029217cf623c767ea5d60bfbd42729ea54d5"
 "checksum unicode-normalization 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)" = "6fb19cf769fa8c6a80a162df694621ebeb4dafb606470b2b2fce0be40a98a977"
 "checksum unicode-segmentation 1.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e83e153d1053cbb5a118eeff7fd5be06ed99153f00dbcd8ae310c5fb2b22edc0"
 "checksum unicode-xid 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
 "checksum url 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "829d4a8476c35c9bf0bbce5a3b23f4106f79728039b726d292bb93bc106787cb"
+"checksum uuid 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "9fde2f6a4bea1d6e007c4ad38c6839fa71cbb63b6dbf5b595aa38dc9b1093c11"
 "checksum vcpkg 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)" = "6454029bf181f092ad1b853286f23e2c507d8e8194d01d92da4a55c274a5508c"
 "checksum version_check 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)" = "b5a972e5669d67ba988ce3dc826706fb0a8b01471c088cb0b6110b805cc36aed"
 "checksum want 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1ce8a968cb1cd110d136ff8b819a556d6fb6d919363c61534f6860c7eb172ba0"
@@ -1942,6 +2378,7 @@ dependencies = [
 "checksum wasm-bindgen-macro-support 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)" = "841a6d1c35c6f596ccea1f82504a192a60378f64b3bb0261904ad8f2f5657556"
 "checksum wasm-bindgen-shared 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)" = "93b162580e34310e5931c4b792560108b10fd14d64915d7fff8ff00180e70092"
 "checksum web-sys 0.3.44 (registry+https://github.com/rust-lang/crates.io-index)" = "dda38f4e5ca63eda02c059d243aa25b5f35ab98451e518c51612cd0f1bd19a47"
+"checksum whoami 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7884773ab69074615cb8f8425d0e53f11710786158704fca70f53e71b0e05504"
 "checksum widestring 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "a763e303c0e0f23b0da40888724762e802a8ffefbc22de4127ef42493c2ea68c"
 "checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
 "checksum winapi 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
@@ -1951,3 +2388,4 @@ dependencies = [
 "checksum winreg 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "b2986deb581c4fe11b621998a5e53361efe6b48a151178d0cd9eeffa4dc6acc9"
 "checksum winreg 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "0120db82e8a1e0b9fb3345a539c478767c0048d842860994d96113d5b667bd69"
 "checksum ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
+"checksum yaml-rust 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)" = "39f0c922f1a334134dc2f7a8b67dc5d25f0735263feec974345ff706bcf20b0d"
diff --git a/chapter03-1/.env b/chapter03-1/.env
new file mode 100644
index 0000000..88cfb53
--- /dev/null
+++ b/chapter03-1/.env
@@ -0,0 +1 @@
+DATABASE_URL="postgres://postgres:password@localhost:5432/newsletter"
diff --git a/chapter03-1/Cargo.toml b/chapter03-1/Cargo.toml
index bea4615..92a4dba 100644
--- a/chapter03-1/Cargo.toml
+++ b/chapter03-1/Cargo.toml
@@ -5,5 +5,24 @@ authors = ["LukeMathWalker <rust@lpalmieri.com>"]
 edition = "2018"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[lib]
+path = "src/lib.rs"
+
+[[bin]]
+path = "src/main.rs"
+name = "chapter03-1"
 
 [dependencies]
+actix-web = "2.0.0"
+actix-rt = "1.1.1"
+tokio = "0.2.22"
+serde = "1.0.115"
+config = { version = "0.10.1", default-features = false, features = ["yaml"] }
+sqlx = { version = "0.4.0-beta.1", default-features = false, features = [ "runtime-tokio", "macros", "postgres", "uuid", "chrono", "migrate"] }
+anyhow = "1.0.32"
+uuid = { version = "0.8.1", features = ["v4"] }
+chrono = "0.4.15"
+
+[dev-dependencies]
+reqwest = { version = "0.10.7", features = ["json"] }
+serde_json = "1.0.57"
diff --git a/chapter03-1/configuration.yaml b/chapter03-1/configuration.yaml
new file mode 100644
index 0000000..c5efa42
--- /dev/null
+++ b/chapter03-1/configuration.yaml
@@ -0,0 +1,6 @@
+database:
+  host: "localhost"
+  port: 5432
+  username: "postgres"
+  password: "password"
+  database_name: "newsletter"
\ No newline at end of file
diff --git a/chapter03-1/migrations/20200823135036_create_subscriptions_table.sql b/chapter03-1/migrations/20200823135036_create_subscriptions_table.sql
new file mode 100644
index 0000000..2c0d262
--- /dev/null
+++ b/chapter03-1/migrations/20200823135036_create_subscriptions_table.sql
@@ -0,0 +1,8 @@
+-- Create Subscriptions Table
+CREATE TABLE subscriptions(
+   id uuid NOT NULL,
+   PRIMARY KEY (id),
+   email TEXT NOT NULL UNIQUE,
+   name TEXT NOT NULL,
+   subscribed_at timestamptz NOT NULL
+);
\ No newline at end of file
diff --git a/chapter03-1/scripts/init_db.sh b/chapter03-1/scripts/init_db.sh
new file mode 100755
index 0000000..6d77eef
--- /dev/null
+++ b/chapter03-1/scripts/init_db.sh
@@ -0,0 +1,42 @@
+#!/usr/bin/env bash
+set -x
+set -eo pipefail
+
+# Check if a custom user has been set, otherwise default to 'postgres'
+DB_USER=${POSTGRES_USER:=postgres}
+# Check if a custom password has been set, otherwise default to 'password'
+DB_PASSWORD="${POSTGRES_PASSWORD:=password}"
+# Check if a custom password has been set, otherwise default to 'newsletter'
+DB_NAME="${POSTGRES_DB:=newsletter}"
+# Check if a custom port has been set, otherwise default to '5432'
+DB_PORT="${POSTGRES_PORT:=5432}"
+# Check if a custom host has been set, otherwise default to 'localhost'
+DB_HOST="${POSTGRES_HOST:=localhost}"
+
+# Allow to skip Docker if a dockerized Postgres database is already running
+if [[ -z "${SKIP_DOCKER}" ]]
+then
+  # Launch postgres using Docker
+  docker run \
+      -e POSTGRES_USER=${DB_USER} \
+      -e POSTGRES_PASSWORD=${DB_PASSWORD} \
+      -e POSTGRES_DB=${DB_NAME} \
+      -p "${DB_PORT}":5432 \
+      -d postgres \
+      postgres -N 1000
+      # ^ Increased maximum number of connections for testing purposes
+fi
+
+# Keep pinging Postgres until it's ready to accept commands
+until PGPASSWORD="${DB_PASSWORD}" psql -h "${DB_HOST}" -U "${DB_USER}" -p "${DB_PORT}" -d "postgres" -c '\q'; do
+  >&2 echo "Postgres is still unavailable - sleeping"
+  sleep 1
+done
+
+>&2 echo "Postgres is up and running on port ${DB_PORT} - running migrations now!"
+
+export DATABASE_URL=postgres://${DB_USER}:${DB_PASSWORD}@${DB_HOST}:${DB_PORT}/${DB_NAME}
+sqlx database create
+sqlx migrate run
+
+>&2 echo "Postgres has been migrated, ready to go!"
diff --git a/chapter03-1/src/configuration.rs b/chapter03-1/src/configuration.rs
new file mode 100644
index 0000000..b18ad0f
--- /dev/null
+++ b/chapter03-1/src/configuration.rs
@@ -0,0 +1,37 @@
+#[derive(serde::Deserialize)]
+pub struct Settings {
+    pub database: DatabaseSettings,
+}
+
+#[derive(serde::Deserialize)]
+pub struct DatabaseSettings {
+    pub username: String,
+    pub password: String,
+    pub port: u16,
+    pub host: String,
+    pub database_name: String,
+}
+
+impl DatabaseSettings {
+    pub fn connection_string(&self) -> String {
+        format!(
+            "postgres://{}:{}@{}:{}/{}",
+            self.username, self.password, self.host, self.port, self.database_name
+        )
+    }
+
+    pub fn connection_string_without_db(&self) -> String {
+        format!(
+            "postgres://{}:{}@{}:{}",
+            self.username, self.password, self.host, self.port
+        )
+    }
+}
+
+pub fn get_configuration() -> Result<Settings, config::ConfigError> {
+    let mut settings = config::Config::default();
+
+    settings.merge(config::File::with_name("configuration"))?;
+
+    settings.try_into()
+}
diff --git a/chapter03-1/src/lib.rs b/chapter03-1/src/lib.rs
new file mode 100644
index 0000000..b477f22
--- /dev/null
+++ b/chapter03-1/src/lib.rs
@@ -0,0 +1,4 @@
+#![allow(clippy::toplevel_ref_arg)]
+pub mod configuration;
+pub mod routes;
+pub mod startup;
diff --git a/chapter03-1/src/main.rs b/chapter03-1/src/main.rs
index e7a11a9..dd7860d 100644
--- a/chapter03-1/src/main.rs
+++ b/chapter03-1/src/main.rs
@@ -1,3 +1,17 @@
-fn main() {
-    println!("Hello, world!");
+use anyhow::Context;
+use chapter03_1::configuration::get_configuration;
+use chapter03_1::startup::run;
+use sqlx::postgres::PgPool;
+use std::net::TcpListener;
+
+#[actix_rt::main]
+async fn main() -> Result<(), anyhow::Error> {
+    let configuration = get_configuration().expect("Failed to read configuration.");
+    let connection_pool = PgPool::connect(&configuration.database.connection_string())
+        .await
+        .map_err(anyhow::Error::from)
+        .with_context(|| "Failed to connect to Postgres.")?;
+    let address = TcpListener::bind("127.0.0.1:8000")?;
+    run(address, connection_pool)?.await?;
+    Ok(())
 }
diff --git a/chapter03-1/src/routes/health_check.rs b/chapter03-1/src/routes/health_check.rs
new file mode 100644
index 0000000..d7eb4e0
--- /dev/null
+++ b/chapter03-1/src/routes/health_check.rs
@@ -0,0 +1,5 @@
+use actix_web::HttpResponse;
+
+pub async fn health_check() -> HttpResponse {
+    HttpResponse::Ok().finish()
+}
diff --git a/chapter03-1/src/routes/mod.rs b/chapter03-1/src/routes/mod.rs
new file mode 100644
index 0000000..90ffeed
--- /dev/null
+++ b/chapter03-1/src/routes/mod.rs
@@ -0,0 +1,5 @@
+mod health_check;
+mod subscriptions;
+
+pub use health_check::*;
+pub use subscriptions::*;
diff --git a/chapter03-1/src/routes/subscriptions.rs b/chapter03-1/src/routes/subscriptions.rs
new file mode 100644
index 0000000..7cccfa7
--- /dev/null
+++ b/chapter03-1/src/routes/subscriptions.rs
@@ -0,0 +1,33 @@
+use actix_web::{web, HttpResponse};
+use chrono::Utc;
+use sqlx::PgPool;
+use uuid::Uuid;
+
+#[derive(serde::Deserialize)]
+pub struct SubscribeRequest {
+    email: String,
+    name: String,
+}
+
+pub async fn subscribe(
+    payload: web::Json<SubscribeRequest>,
+    pool: web::Data<PgPool>,
+) -> Result<HttpResponse, HttpResponse> {
+    sqlx::query!(
+        r#"
+    INSERT INTO subscriptions (id, email, name, subscribed_at)
+    VALUES ($1, $2, $3, $4)
+            "#,
+        Uuid::new_v4(),
+        payload.email,
+        payload.name,
+        Utc::now()
+    )
+    .execute(pool.as_ref())
+    .await
+    .map_err(|e| {
+        println!("Failed to execute query: {}", e);
+        HttpResponse::InternalServerError().finish()
+    })?;
+    Ok(HttpResponse::Ok().finish())
+}
diff --git a/chapter03-1/src/startup.rs b/chapter03-1/src/startup.rs
new file mode 100644
index 0000000..9f35c15
--- /dev/null
+++ b/chapter03-1/src/startup.rs
@@ -0,0 +1,19 @@
+use crate::routes::{health_check, subscribe};
+use actix_web::dev::Server;
+use actix_web::web::Data;
+use actix_web::{web, App, HttpServer};
+use sqlx::PgPool;
+use std::net::TcpListener;
+
+pub fn run(listener: TcpListener, db_pool: PgPool) -> Result<Server, std::io::Error> {
+    let db_pool = Data::new(db_pool);
+    let server = HttpServer::new(move || {
+        App::new()
+            .route("/health_check", web::get().to(health_check))
+            .route("/subscriptions", web::post().to(subscribe))
+            .app_data(db_pool.clone())
+    })
+    .listen(listener)?
+    .run();
+    Ok(server)
+}
diff --git a/chapter03-1/tests/all/health_check.rs b/chapter03-1/tests/all/health_check.rs
new file mode 100644
index 0000000..e0fbb4f
--- /dev/null
+++ b/chapter03-1/tests/all/health_check.rs
@@ -0,0 +1,20 @@
+use crate::helpers::spawn_app;
+
+#[actix_rt::test]
+async fn health_check_works() {
+    // Arrange
+    let app = spawn_app().await;
+    let client = reqwest::Client::new();
+
+    // Act
+    let response = client
+        // Use the returned application address
+        .get(&format!("{}/health_check", &app.address))
+        .send()
+        .await
+        .expect("Failed to execute request.");
+
+    // Assert
+    assert!(response.status().is_success());
+    assert_eq!(Some(0), response.content_length());
+}
diff --git a/chapter03-1/tests/all/helpers.rs b/chapter03-1/tests/all/helpers.rs
new file mode 100644
index 0000000..ac74980
--- /dev/null
+++ b/chapter03-1/tests/all/helpers.rs
@@ -0,0 +1,52 @@
+use chapter03_1::configuration::{get_configuration, DatabaseSettings};
+use chapter03_1::startup::run;
+use sqlx::Executor;
+use sqlx::{Connection, PgConnection, PgPool};
+use std::net::TcpListener;
+use uuid::Uuid;
+
+pub struct TestApp {
+    pub address: String,
+    pub db_pool: PgPool,
+}
+
+pub async fn spawn_app() -> TestApp {
+    let listener = TcpListener::bind("127.0.0.1:0").expect("Failed to bind random port");
+    // We retrieve the port assigned to us by the OS
+    let port = listener.local_addr().unwrap().port();
+
+    let mut configuration = get_configuration().expect("Failed to read configuration.");
+    configuration.database.database_name = Uuid::new_v4().to_string();
+
+    let connection_pool = configure_database(&configuration.database).await;
+
+    let server = run(listener, connection_pool.clone()).expect("Failed to bind address");
+    let _ = tokio::spawn(server);
+    // We return the application address to the caller!
+    TestApp {
+        address: format!("http://127.0.0.1:{}", port),
+        db_pool: connection_pool,
+    }
+}
+
+pub async fn configure_database(config: &DatabaseSettings) -> PgPool {
+    // Create database
+    let mut connection = PgConnection::connect(&config.connection_string_without_db())
+        .await
+        .expect("Failed to connect to Postgres");
+    connection
+        .execute(&*format!(r#"CREATE DATABASE "{}";"#, config.database_name))
+        .await
+        .expect("Failed to create database.");
+
+    // Migrate database
+    let connection_pool = PgPool::connect(&config.connection_string())
+        .await
+        .expect("Failed to connect to Postgres.");
+    sqlx::migrate!("./migrations")
+        .run(&connection_pool)
+        .await
+        .expect("Failed to migrate the database");
+
+    connection_pool
+}
diff --git a/chapter03-1/tests/all/main.rs b/chapter03-1/tests/all/main.rs
new file mode 100644
index 0000000..5333f37
--- /dev/null
+++ b/chapter03-1/tests/all/main.rs
@@ -0,0 +1,3 @@
+mod health_check;
+pub mod helpers;
+mod subscriptions;
diff --git a/chapter03-1/tests/all/subscriptions.rs b/chapter03-1/tests/all/subscriptions.rs
new file mode 100644
index 0000000..1fd53a3
--- /dev/null
+++ b/chapter03-1/tests/all/subscriptions.rs
@@ -0,0 +1,34 @@
+use crate::helpers::spawn_app;
+use serde_json::json;
+
+#[actix_rt::test]
+async fn subscribe_works() {
+    // Arrange
+    let app = spawn_app().await;
+    let client = reqwest::Client::new();
+    let email = "myemail@mydomain.com";
+    let name = "my name";
+    let payload = json!({
+        "email": email,
+        "name": name
+    });
+
+    // Act
+    let response = client
+        .post(&format!("{}/subscriptions", &app.address))
+        .json(&payload)
+        .send()
+        .await
+        .expect("Failed to execute request.");
+
+    // Assert
+    assert!(response.status().is_success());
+
+    let saved = sqlx::query!("SELECT email, name FROM subscriptions",)
+        .fetch_one(&app.db_pool)
+        .await
+        .expect("Failed to fetch saved subscription.");
+
+    assert_eq!(saved.email, email);
+    assert_eq!(saved.name, name);
+}