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-rw-r--r--manual/http_status_codes.md180
-rw-r--r--manual/toc.md1
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diff --git a/manual/http_status_codes.md b/manual/http_status_codes.md
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@@ -0,0 +1,180 @@
+HTTP status codes
+=================
+
+This chapter aims to list all HTTP status codes that Cowboy
+may return, with details on the reasons why. The list given
+here only includes the replies that Cowboy sends, not user
+replies.
+
+100 Continue
+------------
+
+When the client sends an `expect: 100-continue` header,
+Cowboy automatically sends a this status code before
+trying to read the request body. This behavior can be
+disabled using the appropriate body option.
+
+101 Switching Protocols
+-----------------------
+
+This is the status code sent when switching to the
+Websocket protocol.
+
+200 OK
+------
+
+This status code is sent by `cowboy_rest`.
+
+201 Created
+-----------
+
+This status code is sent by `cowboy_rest`.
+
+202 Accepted
+------------
+
+This status code is sent by `cowboy_rest`.
+
+204 No Content
+--------------
+
+This status code is sent when the processing of a request
+ends without any reply having been sent. It may also be
+sent by `cowboy_rest` under normal conditions.
+
+300 Multiple Choices
+--------------------
+
+This status code is sent by `cowboy_rest`.
+
+301 Moved Permanently
+---------------------
+
+This status code is sent by `cowboy_rest`.
+
+303 See Other
+-------------
+
+This status code is sent by `cowboy_rest`.
+
+304 Not Modified
+----------------
+
+This status code is sent by `cowboy_rest`.
+
+307 Temporary Redirect
+----------------------
+
+This status code is sent by `cowboy_rest`.
+
+400 Bad Request
+---------------
+
+Cowboy will send this status code for any of the
+following reasons:
+
+* Too many empty lines were sent before the request.
+* The request-line could not be parsed.
+* Too many headers were sent.
+* A header name was too long.
+* A header value was too long.
+* The host header was missing from an HTTP/1.1 request.
+* The host header could not be parsed.
+* The requested host was not found.
+* The requested path could not be parsed.
+* The accept header could not be parsed when using REST.
+* REST under normal conditions.
+* A Websocket upgrade failed.
+
+401 Unauthorized
+----------------
+
+This status code is sent by `cowboy_rest`.
+
+403 Forbidden
+-------------
+
+This status code is sent by `cowboy_rest`.
+
+404 Not Found
+-------------
+
+This status code is sent when the router successfully
+resolved the host but didn't find a matching path for
+the request. It may also be sent by `cowboy_rest` under
+normal conditions.
+
+405 Method Not Allowed
+----------------------
+
+This status code is sent by `cowboy_rest`.
+
+406 Not Acceptable
+------------------
+
+This status code is sent by `cowboy_rest`.
+
+408 Request Timeout
+-------------------
+
+Cowboy will send this status code to the client if the
+client started to send a request, indicated by the
+request-line being received fully, but failed to send
+all headers in a reasonable time.
+
+409 Conflict
+------------
+
+This status code is sent by `cowboy_rest`.
+
+410 Gone
+--------
+
+This status code is sent by `cowboy_rest`.
+
+412 Precondition Failed
+-----------------------
+
+This status code is sent by `cowboy_rest`.
+
+413 Request Entity Too Large
+----------------------------
+
+This status code is sent by `cowboy_rest`.
+
+414 Request-URI Too Long
+------------------------
+
+Cowboy will send this status code to the client if the
+request-line is too long. It may also be sent by
+`cowboy_rest` under normal conditions.
+
+415 Unsupported Media Type
+--------------------------
+
+This status code is sent by `cowboy_rest`.
+
+500 Internal Server Error
+-------------------------
+
+This status code is sent when a crash occurs in HTTP, loop
+or REST handlers, or when an invalid return value is
+returned. It may also be sent by `cowboy_rest` under
+normal conditions.
+
+501 Not Implemented
+-------------------
+
+This status code is sent by `cowboy_rest`.
+
+503 Service Unavailable
+-----------------------
+
+This status code is sent by `cowboy_rest`.
+
+505 HTTP Version Not Supported
+------------------------------
+
+Cowboy only supports the versions 1.0 and 1.1 of HTTP.
+In all other cases this status code is sent back to the
+client and the connection is closed.
diff --git a/manual/toc.md b/manual/toc.md
index 5a5f77f..165470e 100644
--- a/manual/toc.md
+++ b/manual/toc.md
@@ -18,3 +18,4 @@ The function reference documents the public interface of Cowboy.
* [cowboy_sub_protocol](cowboy_sub_protocol.md)
* [cowboy_websocket](cowboy_websocket.md)
* [cowboy_websocket_handler](cowboy_websocket_handler.md)
+ * [HTTP status codes](http_status_codes.md)