烧瓶和转印编码：分块 [英] Flask and Transfer-Encoding: chunked

问题描述

我们正在尝试让一个Flask Web服务正常工作，而且我们在传输文章时也遇到了一些问题 - 即当标题包含传输编码时：分块。

好像默认烧瓶不支持HTTP 1.1。有没有解决这个问题？

我们运行这个命令：

  $ curl -v -X PUT --headerTransfer-Encoding：chunked-d @pylucene-3.6.1-2-src.tar.gzhttp：// localhost：5000 / async-test
  

反对这个代码：

  @ app.route（/ async-test，methods = ['PUT']）
 def result（）：
 print'-------> '+ str（request.headers）+'< ------------'
 print'------->'+ str（request.data）+' < ------------'
 print'------->'+ str（request.form）+'< -------- ----'
 return'OK'
  

这里是卷曲输出：

  $ curl -v -X PUT --headerTransfer-Encoding：chunked-d @pylucene-3.6.1-2-src .tar.gzhttp：// localhost：5000 / async-test
 *关于连接（）到localhost端口5000（＃0）
 * Trying :: 1 ...连接被拒绝
 *尝试127.0.0.1 ...连接
 *连接到本地主机（127.0.0.1）端口5000（＃0）
> PUT / async-test HTTP / 1.1 
> User-Agent：curl / 7.21.4（universal-apple-darwin11.0）libcurl / 7.21.4 OpenSSL / 0.9.8r zlib / 1.2.5 
>主机：localhost：5000 
>接受：* / * 
> Transfer-Encoding：chunked 
> Content-Type：application / x-www-form-urlencoded 
>期望：100-继续
> 
 * HTTP 1.0，假设身体
 < HTTP / 1.0 200 OK 
< Content-Type：text / html; charset = utf-8 
<内容长度：2 
 <服务器：Werkzeug / 0.8.3 Python / 2.7.1 
<日期：2013年1月2日星期三21:43:24 GMT 
 < 
  

这里是Flask服务器的输出：

  *在0.0.0.0:5000/ 
上运行-------> Transfer-Encoding：chunked 
 Content-Length：
用户-Agent：curl / 7.21.4（universal-apple-darwin11.0）libcurl / 7.21.4 OpenSSL / 0.9.8r zlib / 1.2.5 
主机：localhost：5000 
期望值：100-continue 
接受：* / * 
内容类型：application / x-www-form-urlencoded 
 
 <------------ 
 ------->< ------------ 
 -------&&&& ImmutableMultiDict（[]）< ----- ------- 
  

解决方案

Python，它的mod_wsgi。只有mod_wsgi版本3.0+开始支持分块的http传输。 Flask Python内部使用Werkzeug工具包作为mod_wsgi的接口。如果你从apt源安装它，它可能是一个旧版本。

尝试编译最新版本的mod_wsgi，然后安装Flask框架，它可以解决问题。

We're trying get a Flask web service working, and we're having some issues with streaming posts - i.e. when the header includes Transfer-Encoding: chunked.

It seems like the default flask does not support HTTP 1.1. Is there a work around for this?

We are running this command:

$ curl -v -X PUT  --header "Transfer-Encoding: chunked" -d @pylucene-3.6.1-2-src.tar.gz "http://localhost:5000/async-test"

Against this code:

@app.route("/async-test", methods=['PUT'])
def result():
    print '------->'+str(request.headers)+'<------------'
    print '------->'+str(request.data)+'<------------'
    print '------->'+str(request.form)+'<------------'
    return 'OK'

Here's the curl output:

$ curl -v -X PUT  --header "Transfer-Encoding: chunked" -d @pylucene-3.6.1-2-src.tar.gz "http://localhost:5000/async-test"
* About to connect() to localhost port 5000 (#0)
*   Trying ::1... Connection refused
*   Trying 127.0.0.1... connected
* Connected to localhost (127.0.0.1) port 5000 (#0)
> PUT /async-test HTTP/1.1
> User-Agent: curl/7.21.4 (universal-apple-darwin11.0) libcurl/7.21.4 OpenSSL/0.9.8r zlib/1.2.5
> Host: localhost:5000
> Accept: */*
> Transfer-Encoding: chunked
> Content-Type: application/x-www-form-urlencoded
> Expect: 100-continue
>
* HTTP 1.0, assume close after body
< HTTP/1.0 200 OK
< Content-Type: text/html; charset=utf-8
< Content-Length: 2
< Server: Werkzeug/0.8.3 Python/2.7.1
< Date: Wed, 02 Jan 2013 21:43:24 GMT
<

And here's the Flask server output:

* Running on 0.0.0.0:5000/ 
------->Transfer-Encoding: chunked
 Content-Length:
 User-Agent: curl/7.21.4 (universal-apple-darwin11.0) libcurl/7.21.4 OpenSSL/0.9.8r zlib/1.2.5
 Host: localhost:5000
 Expect: 100-continue
 Accept: */*
 Content-Type: application/x-www-form-urlencoded

 <------------
 -------><------------
 ------->ImmutableMultiDict([])<------------

解决方案

Its not the Flask Python, its the mod_wsgi. Only mod_wsgi versions 3.0+ started to support chunked http transfers. Flask Python internally use Werkzeug tool-kit as an interface to mod_wsgi. If you installed it from the apt sources it may be an old version.

Try compiling the latest version of mod_wsgi and then install the Flask framework, it may solve the problem.

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