blocks|key|216747|text|IETF+Websocket+(HyBi)工作组正在对一个compression+extension执行worked+on操作。我建议关注他们的邮件列表以获取最新信息。我也推荐你去看看this+question。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|216748|216749|2017年更新:该扩展现已推出一段时间，请参阅此处：https://www.rfc-editor.org/rfc/rfc7692|216750|entityMap|0|LINK|mutability|MUTABLE|url|http://tools.ietf.org/wg/hybi/|1|https://datatracker.ietf.org/doc/html/draft-tyoshino-hybi-permessage-compression-00|2|http://www.ietf.org/mail-archive/web/hybi/current/msg09758.html|3|https://stackoverflow.com/questions/11553345/access-chromes-internal-gzip-routine-from-javascript|4|https://www.rfc-editor.org/rfc/rfc7692^0|G|4|0|T|L|1|1G|9|2|2K|D|3|0|0|Q|12|4|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]|$A|10|B|11|1|12]|$A|13|B|14|1|15]|$A|16|B|17|1|18]]|C|$]]|$1|D|3|-4|5|6|7|19|8|@]|9|@]|C|$]]|$1|E|3|F|5|6|7|1A|8|@]|9|@$A|1B|B|1C|1|1D]]|C|$]]|$1|G|3|-4|5|6|7|1E|8|@]|9|@]|C|$]]]|H|$I|$5|J|K|L|C|$M|N]]|O|$5|J|K|L|C|$M|P]]|Q|$5|J|K|L|C|$M|R]]|S|$5|J|K|L|C|$M|T]]|U|$5|J|K|L|C|$M|V]]]]

There is a <a href="https://datatracker.ietf.org/doc/html/draft-tyoshino-hybi-permessage-compression-00" rel="nofollow noreferrer">compression extension</a> being <a href="http://www.ietf.org/mail-archive/web/hybi/current/msg09758.html" rel="nofollow noreferrer">worked on</a> by the IETF Websocket (<a href="http://tools.ietf.org/wg/hybi/" rel="nofollow noreferrer">HyBi</a>) working group. I would suggest following their mailing list for up-to-date information. I also recommend checking out <a href="https://stackoverflow.com/questions/11553345/access-chromes-internal-gzip-routine-from-javascript">this question</a>.
<hr />
Update 2017: The extension has now been available for some time, see here: <a href="https://www.rfc-editor.org/rfc/rfc7692" rel="nofollow noreferrer">https://www.rfc-editor.org/rfc/rfc7692</a>

blocks|key|221802|text|在某些浏览器中，默认情况下会启用WebSocket压缩(在撰写本文时，例如在Chrome中启用，但在Firefox中不启用)。客户端必须为此包含“Sec-WebSocket-Extensions:permessage-deflate”标头。如果服务器使用相同的扩展名进行响应，则WebSocket通信将以帧为单位进行压缩。据我所知，目前还没有浏览器API来启用/禁用扩展。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|221803|关于这个主题的一篇好文章是：https://www.igvita.com/2013/11/27/configuring-and-optimizing-websocket-compression/|offset|length|221804|entityMap|0|LINK|mutability|MUTABLE|url|https://www.igvita.com/2013/11/27/configuring-and-optimizing-websocket-compression/^0|0|E|2B|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

WebSocket compression is enabled in some browsers by default (at the time of writing for example in Chrome, but not in Firefox). The client has to include the 'Sec-WebSocket-Extensions: permessage-deflate' header for this. If the server responds with the same extension, the WebSocket communication is compressed on a frame basis. As far as I know, there is no browser API to enable/disable extensions.

A good article about the topic is: <a href="https://www.igvita.com/2013/11/27/configuring-and-optimizing-websocket-compression/" rel="noreferrer">https://www.igvita.com/2013/11/27/configuring-and-optimizing-websocket-compression/</a>

blocks|key|3082135|text|是的，有可能。Chrome+19%2B+supports+it.|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3082136|"https://github.com/crossbario/autobahn-python/blob/master/examples/twisted/websocket/echo_compressed/server_advanced.py"

from+twisted.internet+import+reactor
from+twisted.web.server+import+Site
from+twisted.web.static+import+File

from+autobahn.twisted.websocket+import+WebSocketServerFactory,+\
++++listenWS

from+autobahn.websocket.compress+import+*

def+accept(offers):
++++for+offer+in+offers:
++++++++return+PerMessageDeflateOfferAccept(offer)

debug+=+True
factory+=+WebSocketServerFactory(u"ws://127.0.0.1:9000",+debug=debug,+debugCodePaths=debug)
factory.setProtocolOptions(perMessageCompressionAccept=accept)

listenWS(factory)

webdir+=+File(".")
web+=+Site(webdir)
reactor.listenTCP(8080,+web)

reactor.run()|code-block|syntax|javascript|3082137|更多信息：how+PerMessageDeflateOffer+is+used+in+Autobahn+examples。|3082138|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/11643109/819417|1|http://nullege.com/codes/search/autobahn.websocket.compress.PerMessageDeflateOffer^0|7|N|0|0|0|5|1J|1|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@$A|10|B|11|1|12]]|C|$]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]|S|$5|N|O|P|C|$Q|T]]]]

Yes it could. <a href="https://stackoverflow.com/a/11643109/819417">Chrome 19+ supports it.</a>

<pre class="lang-py prettyprint-override"><code>"https://github.com/crossbario/autobahn-python/blob/master/examples/twisted/websocket/echo_compressed/server_advanced.py"

from twisted.internet import reactor
from twisted.web.server import Site
from twisted.web.static import File

from autobahn.twisted.websocket import WebSocketServerFactory, \
 listenWS

from autobahn.websocket.compress import *

def accept(offers):
 for offer in offers:
 return PerMessageDeflateOfferAccept(offer)

debug = True
factory = WebSocketServerFactory(u"ws://127.0.0.1:9000", debug=debug, debugCodePaths=debug)
factory.setProtocolOptions(perMessageCompressionAccept=accept)

listenWS(factory)

webdir = File(".")
web = Site(webdir)
reactor.listenTCP(8080, web)

reactor.run()
</code></pre>

More info: <a href="http://nullege.com/codes/search/autobahn.websocket.compress.PerMessageDeflateOffer" rel="nofollow noreferrer">how PerMessageDeflateOffer is used in Autobahn examples</a>.

After the success handshake of WebSocket, could we used gzip compression?

Here are my tests: 

<ol>
<li>I use autobahn lib to build a server, then respon to client as: 
<code>HTTP/1.1 101 Switching Protocols content-encoding: gzip Connection: Upgrade Server: AutobahnPython/?.?.? Upgrade:
WebSocket Sec-WebSocket-Accept: RIR8KmljoV8Cv9mdiLY7GM2nYMc=</code> </li>
<li>then my server uses gzip compression </li>
<li>and the chrome browser got the result, but it told me that "could not decode a text frame as UTF-8"</li>
</ol>

Could websocket support gzip compression?

服务器

在成功握手WebSocket之后，我们可以使用gzip压缩吗？以下是我的测试：我使用autobahn lib构建服务器，然后以如下方式响应客户端：HTTP/1.1 101 Switching Protocols   content-encoding: gzip   Connection: Upgrade   Serve...

问websocket能支持gzip压缩吗？
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