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[appendix]
== Migrating from Cowboy 2.5 to 2.6
Cowboy 2.6 greatly refactored the HTTP/2 code, a large
part of which was moved to Cowlib and is now used by
both the Cowboy server and the Gun client.
A large number of tickets were also closed which
resulted in many bugs fixed and many features and
options added, although some of them are still
experimental.
=== Features added
* Add support for the PROXY protocol header.
It can be enabled via the `proxy_header` option.
The proxy information can then be found under
the `proxy_info` key in the Req object.
* Allow using sendfile tuples in `cowboy_req:stream_body/3`
and in the data command in stream handlers. The only
caveat is that when using `cowboy_compress_h` the
sendfile tuples may have to be converted to in-memory
data in order to compress them. This is the case for
gzip compression.
* The stream handlers `cowboy_stream_h` and
`cowboy_compress_h` are now documented.
* Add the `chunked` option to allow disabling chunked
transfer-encoding for HTTP/1.1 connections.
* Add the `http10_keepalive` option to allow disabling
keep-alive for HTTP/1.0 connections.
* Add the `idle_timeout` option for HTTP/2.
* Add the `sendfile` option to both HTTP/1.1 and HTTP/2.
It allows disabling the sendfile syscall entirely for
all connections. It is recommended to disable sendfile
when using VirtualBox shared folders.
* Add the `rate_limited/2` callback to REST handlers.
* Add the `deflate_opts` option to Websocket handlers that
allows configuring deflate options for the
permessage-deflate extension.
* Add the `charset` option to `cowboy_static`.
* Add support for the SameSite cookie attribute.
* Update Ranch to 1.7.0
* Update Cowlib to 2.7.0
=== Experimental features added
* Add support for range requests (RFC7233) in REST handlers.
This adds two new callbacks: `ranges_accepted/2` and
`range_satisfiable/2` along with the user-specified
`ProvideRangeCallback/2`.
* Add automatic handling of range requests to REST handlers
that return the callback `auto` from `ranges_accepted/2`.
Cowboy will call the configured `ProvideCallback` and
then split the ouput automatically for the ranged response.
* Enable range requests support in `cowboy_static`.
* Add the `{deflate, boolean()}` Websocket handler
command to disable permessage-deflate compression
temporarily.
* Add the `compress_threshold` option which allows
configuring how much data must be present in a
response body to compress it. This only applies
to non-streamed bodies at this time.
* Add the `compress_buffering` option which allows
controlling whether some buffering may be done
when streaming a response body. Change the default
behavior to not buffer to make sure it works by
default in all scenarios.
* Add the `{set_options, map()}` command to stream
handlers and Websocket handlers. This can be used
to update options on a per-request basis. Allow
overriding the `idle_timeout` option for both
HTTP/1.1 and Websocket, the `cowboy_compress_h`
options for HTTP/1.1 and HTTP/2 and the `chunked`
option for HTTP/1.1.
=== Bugs fixed
* Do not send a content-length automatically with
304 responses. This status code allows a content-length
that corresponds to what would have been sent for a 200
response, but is never followed by a body.
* HTTP/2 streams are now terminated once the body
has been sent fully, instead of immediately once
the stop command is returned (by default when the
request process exits). Metrics will therefore
more accurately represent when a stream ended.
* Terminate connection processes gracefully when the
parent process exists or when sys:terminate/2,3
is called.
* Automatically ignore the boundary parameter of multipart
media types when using REST handlers. This is a special
parameter that may change with all requests and cannot
be predicted.
* Fix parsing of the accept header when it contains charset
parameters. They are case insensitive and will now be
lowercased, like for accept-charset and content-type.
* Handle the charset parameter using `charsets_provided`
when it is present in the accept header when using
REST handlers.
* Don't select charsets when the q-value is 0 in REST
handlers.
* Handle accept-charset headers that include a wildcard
in REST handlers.
* Only send a charset header when the content-type
negotiated is of type text in REST handlers.
* Remove the default charset iso-8859-1 from REST
handlers when no other is provided. This has been
removed from the HTTP specifications for a long time.
* Many cases where a content-type header was sent
unnecessarily in the REST handlers response have
been fixed.
* Handle error_response commands in `cowboy_metrics_h`.
* A number of types and function specifications were
fixed or improved. Dialyzer is now run against both
the code and tests to help uncover issues.
* An undefined `cowboy_router` behavior has been
documented.
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