【已解决】python执行出错：HTTPError: HTTP Error 502: Bad Gateway

【背景】

某此脚本执行，出现错误：LINE 1687 : ERROR    Unknown Error !

Traceback (most recent call last):

File “E:WebServerWordPressto_wphi-baidu-mover_v2hi-baidu-mover_v2011-12-24.py”, line 1685, in

try:

File “E:WebServerWordPressto_wphi-baidu-mover_v2hi-baidu-mover_v2011-12-24.py”, line 1632, in main

gVal[‘statInfoDict’][‘exportedItemIdx’] += 1

File “E:WebServerWordPressto_wphi-baidu-mover_v2hi-baidu-mover_v2011-12-24.py”, line 1351, in exportEntry

calcTimeStart(“translate_post_name”)

File “E:WebServerWordPressto_wphi-baidu-mover_v2hi-baidu-mover_v2011-12-24.py”, line 849, in translateString

trans_req.add_header(‘User-Agent’, “Mozilla/4.0 (compatible;MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)”)

File “E:dev_install_rootPython27liburllib2.py”, line 126, in urlopen

return _opener.open(url, data, timeout)

File “E:dev_install_rootPython27liburllib2.py”, line 400, in open

response = meth(req, response)

File “E:dev_install_rootPython27liburllib2.py”, line 513, in http_response

‘http’, request, response, code, msg, hdrs)

File “E:dev_install_rootPython27liburllib2.py”, line 438, in error

return self._call_chain(*args)

File “E:dev_install_rootPython27liburllib2.py”, line 372, in _call_chain

result = func(*args)

File “E:dev_install_rootPython27liburllib2.py”, line 521, in http_error_default

raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)

HTTPError: HTTP Error 502: Bad Gateway

Traceback (most recent call last):

File “E:WebServerWordPressto_wphi-baidu-mover_v2hi-baidu-mover_v2011-12-24.py”, line 1685, in

try:

File “E:WebServerWordPressto_wphi-baidu-mover_v2hi-baidu-mover_v2011-12-24.py”, line 1632, in main

gVal[‘statInfoDict’][‘exportedItemIdx’] += 1

File “E:WebServerWordPressto_wphi-baidu-mover_v2hi-baidu-mover_v2011-12-24.py”, line 1351, in exportEntry

calcTimeStart(“translate_post_name”)

File “E:WebServerWordPressto_wphi-baidu-mover_v2hi-baidu-mover_v2011-12-24.py”, line 849, in translateString

trans_req.add_header(‘User-Agent’, “Mozilla/4.0 (compatible;MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)”)

File “E:dev_install_rootPython27liburllib2.py”, line 126, in urlopen

return _opener.open(url, data, timeout)

File “E:dev_install_rootPython27liburllib2.py”, line 400, in open

response = meth(req, response)

File “E:dev_install_rootPython27liburllib2.py”, line 513, in http_response

‘http’, request, response, code, msg, hdrs)

File “E:dev_install_rootPython27liburllib2.py”, line 438, in error

return self._call_chain(*args)

File “E:dev_install_rootPython27liburllib2.py”, line 372, in _call_chain

result = func(*args)

File “E:dev_install_rootPython27liburllib2.py”, line 521, in http_error_default

raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)

暂时不知道是什么具体原因导致的。

虽然表面看起来是网络断了，但是好像网络是正常的，所以按理来说不应该出现这个错误才对。

后来又重新运行了一次，就没出现这个错误。

【后记 2011-12-25】

后来去看了代码，才发现，其实这里的错误，是有缘由的。

那就是，上述代码中调用了translateString函数，函数内部，调用了google的翻译功能，即向google发送请求然后获得翻译后的结果。

此翻译功能，google方面是有限制的，在一定时间内，超过一定请求，就会暂时对该ip停止此功能。

此处的错误，就是这个原因引起的，即在短时间内，发起了太多的翻译请求，所以google就会暂时停止提供此服务，导致HTTPError: HTTP Error 502: Bad Gateway的错误。

【解决办法】

解决办法很简单，那就是程序实现翻译功能的时候，保证不要一次性地，同一个短时间内，发出太多这样的翻译请求，把大量的翻译请求，分开来做，就可以了。