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-[[req_body]]
-== Reading the request body
-
-The request body can be read using the Req object.
-
-Cowboy will not attempt to read the body until requested.
-You need to call the body reading functions in order to
-retrieve it.
-
-Cowboy will not cache the body, it is therefore only
-possible to read it once.
-
-You are not required to read it, however. If a body is
-present and was not read, Cowboy will either cancel or
-skip its download, depending on the protocol.
-
-Cowboy provides functions for reading the body raw,
-and read and parse form urlencoded or xref:multipart[multipart bodies].
-The latter is covered in its own chapter.
-
-=== Request body presence
-
-Not all requests come with a body. You can check for
-the presence of a request body with this function:
-
-[source,erlang]
-cowboy_req:has_body(Req).
-
-It returns `true` if there is a body; `false` otherwise.
-
-In practice, this function is rarely used. When the
-method is `POST`, `PUT` or `PATCH`, the request body
-is often required by the application, which should
-just attempt to read it directly.
-
-=== Request body length
-
-You can obtain the length of the body:
-
-[source,erlang]
-Length = cowboy_req:body_length(Req).
-
-Note that the length may not be known in advance. In
-that case `undefined` will be returned. This can happen
-with HTTP/1.1's chunked transfer-encoding, or HTTP/2
-when no content-length was provided.
-
-Cowboy will update the body length in the Req object
-once the body has been read completely. A length will
-always be returned when attempting to call this function
-after reading the body completely.
-
-=== Reading the body
-
-You can read the entire body with one function call:
-
-[source,erlang]
-{ok, Data, Req} = cowboy_req:read_body(Req0).
-
-Cowboy returns an `ok` tuple when the body has been
-read fully.
-
-By default, Cowboy will attempt to read up to 8MB
-of data, for up to 15 seconds. The call will return
-once Cowboy has read at least 8MB of data, or at
-the end of the 15 seconds period.
-
-These values can be customized. For example, to read
-only up to 1MB for up to 5 seconds:
-
-[source,erlang]
-----
-{ok, Data, Req} = cowboy_req:read_body(Req0,
-    #{length => 1000000, period => 5000}).
-----
-
-You may also disable the length limit:
-
-[source,erlang]
-{ok, Data, Req} = cowboy_req:read_body(Req0, #{length => infinity}).
-
-This makes the function wait 15 seconds and return with
-whatever arrived during that period. This is not
-recommended for public facing applications.
-
-These two options can effectively be used to control
-the rate of transmission of the request body.
-
-=== Streaming the body
-
-When the body is too large, the first call will return
-a `more` tuple instead of `ok`. You can call the
-function again to read more of the body, reading
-it one chunk at a time.
-
-[source,erlang]
-----
-read_body_to_console(Req0) ->
-    case cowboy_req:read_body(Req0) of
-        {ok, Data, Req} ->
-            io:format("~s", [Data]),
-            Req;
-        {more, Data, Req} ->
-            io:format("~s", [Data]),
-            read_body_to_console(Req)
-    end.
-----
-
-The `length` and `period` options can also be used.
-They need to be passed for every call.
-
-=== Reading a form urlencoded body
-
-Cowboy provides a convenient function for reading and
-parsing bodies sent as application/x-www-form-urlencoded.
-
-[source,erlang]
-{ok, KeyValues, Req} = cowboy_req:read_urlencoded_body(Req0).
-
-This function returns a list of key/values, exactly like
-the function `cowboy_req:parse_qs/1`.
-
-The defaults for this function are different. Cowboy will
-read for up to 64KB and up to 5 seconds. They can be modified:
-
-[source,erlang]
-----
-{ok, KeyValues, Req} = cowboy_req:read_urlencoded_body(Req0,
-    #{length => 4096, period => 3000}).
-----