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Introduces 3 low level functions and updates the existing higher
levels functions. The new primitives are has_body/1, body_length/1
and stream_body/1. In addition to that, a helper function
init_stream/4 has been added.
Streaming a body implies to decode the Transfer-Encoding and
Content-Encoding used for the body. By default, Cowboy will try
to figure out what was used and decode them properly. You can
override this if you want to disable this behavior or simply
support more encodings by calling the init_stream/4 function
before you start streaming the body.
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https://github.com/tillitech/cowboy
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This new protocol option is a fun.
It expects a single arg, the Req, and should only return a possibly
modified Req. This can be used for many things like URL rewriting,
access logging or listener-wide authentication.
If a reply is sent inside the hook, then Cowboy will consider the
request handled and will move on to the next one.
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Fixes compatibility issue #140 reported by @majek.
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https://github.com/dysinger/cowboy
Added a comment explaining the '*' always matching.
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https://github.com/tillitech/cowboy
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Thanks go to @superbobry for pointing it out.
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Certain user agents send slightly invalid media types, like the
following: "text/html, image/gif, image/jpeg, ; q=.2, */; q=.2"
The user agent with which this behavior was observed presented itself
with the User-Agent string: "Mozilla/5.0 (Macintosh; U; Intel Mac OS X
10.6; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (FlipboardProxy/0.0.5;
+http://flipboard.com/browserproxy)"
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The return value from the generate_etag/2 callback is expected to be a
binary tagged with either weak or strong. This binary is quoted, and
may be prefixed with W/ before it is set as the value of the ETag header
in the response.
For backwards compatibility with older handlers where the return value
was expected to be a quoted binary a function has been added to parse any
return values that are untagged binaries. All untagged binaries are expected
to be a valid value for the ETag header.
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Polish dialyzer warnings on supervisor init/1
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When missing rebar couldn't build docs because it expects the ebin/
folder to exist before it runs edoc. This commit allows users to
build docs without first having to run make.
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This was initially an internal function, it has been made public
due to popular demand as it can sometimes be needed.
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Otherwise acceptors will not be upgraded properly until after the
next request comes in.
Thanks to DeadZen for pointing it out.
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At the same time renaming cowboy_http:content_type_params/3 to
cowboy_http:params/2 (with a default Acc of []) as this code isn't
useful only for content types.
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If requests go through a proxy, they will have the original uri in the
request, i.e. : GET http://proxy.server.uri/some/query/string HTTP 1.1 ...
That was problematic -- cowboy_http_protocol:request didn't know what to
to with the result of decode_packet applied to this, which would be something
like:
``` erlang
{http_request,'GET',{absoluteURI,http,<<"proxy.server.uri">>,
undefined,<<"/some/query/string">>},{1,1}}
```
So, I just ignore the host, grab the path and pass into
``` erlang
cowboy_http_protocol:request({http_request, Method, {abs_path, Path},
Version}, State)
```
Seems to do the trick without much effort.
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Initially recommended by Magnus Klaar, the trick is to add a catch
instruction before the erlang:hibernate/3 call so that Dialyzer
thinks it will return, followed by the expected return value
('ok' for HTTP, 'closed' for websockets).
This should be good enough until a real solution is found.
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queue:len/1 is O(len(Q))
queue:out/1 is O(1) amortized, O(len(Q)) worst case
Replace with a pattern match
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We've been having many recurring issues, some which were fixed,
only to have other things broken again. Can't rely on a service
that breaks all the time.
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This needs python2 to be the default python in /usr/bin/python.
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The previous solution was retrieving the last put connection
and wasn't a real queue, so this solution should improve the
overall latency under load.
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Goes from 36s to 24s on my laptop.
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This allows any application to upgrade the protocol options without
having to restart the listener. This is most useful to update the
dispatch list of HTTP servers, for example.
The upgrade is done at the acceptor level, meaning only new connections
receive the new protocol options.
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This is a big change in the internal cowboy API. This should not
have any impact on existing applications as only the acceptor is
expected to use these API calls.
The function cowboy_listener:wait/3 has been removed. max_connections
checking now occurs directly in cowboy_listener:add_connection/3.
If the pool is full and the acceptor has to wait, then it doesn't
return, waiting for a free space to be available.
To accomodate these changes, it is now cowboy_listener that will
inform the new connection that it is ready by sending {shoot, self()}.
This should be a great improvement to the latency of responses as
there is one less message to wait for before the request process
can do its work.
Overall the performance under heavy load should also be improved as
we greatly reduce the number of messages sent between the acceptor
and the listener process.
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