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authorLoïc Hoguin <[email protected]>2016-01-14 13:35:25 +0100
committerLoïc Hoguin <[email protected]>2016-01-14 13:37:20 +0100
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-::: Middlewares
-
-Cowboy delegates the request processing to middleware components.
-By default, two middlewares are defined, for the routing and handling
-of the request, as is detailed in most of this guide.
-
-Middlewares give you complete control over how requests are to be
-processed. You can add your own middlewares to the mix or completely
-change the chain of middlewares as needed.
-
-Cowboy will execute all middlewares in the given order, unless one
-of them decides to stop processing.
-
-:: Usage
-
-Middlewares only need to implement a single callback: `execute/2`.
-It is defined in the `cowboy_middleware` behavior.
-
-This callback has two arguments. The first is the `Req` object.
-The second is the environment.
-
-Middlewares can return one of three different values:
-
-* `{ok, Req, Env}` to continue the request processing
-* `{suspend, Module, Function, Args}` to hibernate
-* `{stop, Req}` to stop processing and move on to the next request
-
-Of note is that when hibernating, processing will resume on the given
-MFA, discarding all previous stacktrace. Make sure you keep the `Req`
-and `Env` in the arguments of this MFA for later use.
-
-If an error happens during middleware processing, Cowboy will not try
-to send an error back to the socket, the process will just crash. It
-is up to the middleware to make sure that a reply is sent if something
-goes wrong.
-
-:: Configuration
-
-The middleware environment is defined as the `env` protocol option.
-In the previous chapters we saw it briefly when we needed to pass
-the routing information. It is a list of tuples with the first
-element being an atom and the second any Erlang term.
-
-Two values in the environment are reserved:
-
-* `listener` contains the name of the listener
-* `result` contains the result of the processing
-
-The `listener` value is always defined. The `result` value can be
-set by any middleware. If set to anything other than `ok`, Cowboy
-will not process any subsequent requests on this connection.
-
-The middlewares that come with Cowboy may define or require other
-environment values to perform.
-
-You can update the environment by calling the `cowboy:set_env/3`
-convenience function, adding or replacing a value in the environment.
-
-:: Routing middleware
-
-The routing middleware requires the `dispatch` value. If routing
-succeeds, it will put the handler name and options in the `handler`
-and `handler_opts` values of the environment, respectively.
-
-:: Handler middleware
-
-The handler middleware requires the `handler` and `handler_opts`
-values. It puts the result of the request handling into `result`.