update guide

guide/src/qs_5.md

@@ -11,7 +11,7 @@ Prefix handler:
 ```rust
 # extern crate actix_web;
 # use actix_web::*;
-
+# 
 fn index(req: HttpRequest) -> HttpResponse {
    unimplemented!()
 }
@@ -30,7 +30,7 @@ Application prefix combines with handler prefix i.e
 ```rust
 # extern crate actix_web;
 # use actix_web::*;
-
+# 
 fn index(req: HttpRequest) -> HttpResponse {
    unimplemented!()
 }
@@ -51,7 +51,7 @@ if no route could be matched default response `HTTPMethodNotAllowed` get resturn
 ```rust
 # extern crate actix_web;
 # use actix_web::*;
-
+# 
 fn main() {
     Application::default("/")
         .resource("/prefix", |r| {
@@ -102,7 +102,7 @@ You can also specify a custom regex in the form `{identifier:regex}`:
 # fn index(req: HttpRequest) -> String {
 #     format!("Hello, {}", &req.match_info()["name"])
 # }
-
+# 
 fn main() {
     Application::default("/")
         .resource(r"{name:\d+}", |r| r.method(Method::GET).f(index))
@@ -115,7 +115,7 @@ implements `FromParam` trait. For example most of standard integer types
 implements `FromParam` trait. i.e.:
 
 ```rust
-extern crate actix_web;
+# extern crate actix_web;
 use actix_web::*;
 
 fn index(req: HttpRequest) -> Result<String> {
@@ -135,7 +135,13 @@ For this example for path '/a/1/2/', values v1 and v2 will resolve to "1" and "2
 
 It is possible to match path tail with custom `.*` regex.
 
-```rust,ignore
+```rust
+# extern crate actix_web;
+# use actix_web::*;
+# 
+# fn index(req: HttpRequest) -> HttpResponse {
+#    unimplemented!()
+# }
 fn main() {
     Application::default("/")
         .resource(r"/test/{tail:.*}", |r| r.method(Method::GET).f(index))

guide/src/qs_7.md

@@ -1,9 +1,31 @@
 # HttpRequest & HttpResponse
 
+## Response
+
+Builder-like patter is used to construct an instance of `HttpResponse`.
+`HttpResponse` provides several method that returns `HttpResponseBuilder` instance,
+which is implements various convinience methods that helps build response.
+Check [documentation](../actix_web/dev/struct.HttpResponseBuilder.html)
+for type description. Methods `.body`, `.finish`, `.json` finalizes response creation,
+if this methods get call for the same builder instance, builder will panic.
+
+```rust
+# extern crate actix_web;
+use actix_web::*;
+
+fn index(req: HttpRequest) -> HttpResponse {
+    HttpResponse::Ok()
+        .content_encoding(ContentEncoding::Br)
+        .content_type("plain/text")
+        .header("X-Hdr", "sample")
+        .body("data").unwrap()
+}
+# fn main() {}
+```
+
 ## Content encoding
 
-Actix automatically *compress*/*decompress* payload. 
-Following codecs are supported: 
+Actix automatically *compress*/*decompress* payload. Following codecs are supported: 
 
  * Brotli
  * Gzip

src/httpresponse.rs

@@ -373,6 +373,7 @@ impl HttpResponseBuilder {
         self
     }
 
+    /// Calls provided closure with builder reference if value is true.
     pub fn if_true<F>(&mut self, value: bool, f: F) -> &mut Self
         where F: Fn(&mut HttpResponseBuilder) + 'static
     {