为什么Python的urllib2.urlopen()为成功的状态码引发HTTPError?

问题描述

根据 urllib2文档，

还有以下代码

request = urllib2.Request(url, data, headers)
response = urllib2.urlopen(request)

引发代码201(已创建)的HTTPError:

raises an HTTPError with code 201 (created):

ERROR    2011-08-11 20:40:17,318 __init__.py:463] HTTP Error 201: Created

那为什么 urllib2 在成功的请求上抛出HTTPErrors?

So why is urllib2 throwing HTTPErrors on this successful request?

这不是很痛苦.我可以轻松地将代码扩展到:

It's not too much of a pain; I can easily extend the code to:

try:
    request = urllib2.Request(url, data, headers)
    response = urllib2.urlopen(request)
except HTTPError, e:
    if e.code == 201:
        # success! :)
    else:
        # fail! :(
else:
    # when will this happen...?

但是，根据文档和我无法找到有关此奇怪行为的类似问题的事实，这似乎不是预期的行为.

But this doesn't seem like the intended behavior, based on the documentation and the fact that I can't find similar questions about this odd behavior.

此外， else 块应该有什么期望?如果成功的状态码都被解释为 HTTPError ，那么什么时候> urllib2.urlopen()只是返回一个普通的类似文件的响应对象，就像所有 urllib2 文档所引用的那样?

Also, what should the else block be expecting? If successful status codes are all interpreted as HTTPErrors, then when does urllib2.urlopen() just return a normal file-like response object like all the urllib2 documentation refers to?

推荐答案

实际的库文档中提到:

对于非200错误代码，这只是通过OpenerDirector.error()将作业传递给protocol_error_code处理程序方法.最终，如果没有其他处理程序处理该错误，则urllib2.HTTPDefaultErrorHandler将引发HTTPError.

For non-200 error codes, this simply passes the job on to the protocol_error_code handler methods, via OpenerDirector.error(). Eventually, urllib2.HTTPDefaultErrorHandler will raise an HTTPError if no other handler handles the error.

http://docs.python.org/library/urllib2.html#httperrorprocessor-objects

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