解决python3中自定义wsgi函数,make_server函数报错的问题
#coding:utf-8 fromwsgiref.simple_serverimportmake_server defRunServer(environ,start_response): start_response('200OK',[('Content-Type','text/html')]) return'Hello,web!
' if__name__=='__main__': httpd=make_server('localhost',8000,RunServer) print("ServingHTTPonport8000...") httpd.serve_forever()
这段代码在python2.7中可以运行,到python3.4中运行,就开始报错,报错内容如下:
ServingHTTPonport8000... 127.0.0.1--[12/Apr/201616:44:17]"GET/HTTP/1.1"2000 Traceback(mostrecentcalllast): File"C:\Python34\lib\wsgiref\handlers.py",line138,inrun self.finish_response() File"C:\Python34\lib\wsgiref\handlers.py",line181,infinish_response self.write(data) File"C:\Python34\lib\wsgiref\handlers.py",line267,inwrite "write()argumentmustbeabytesinstance" AssertionError:write()argumentmustbeabytesinstance 127.0.0.1--[12/Apr/201616:44:17]"GET/HTTP/1.1"50059 Traceback(mostrecentcalllast): File"C:\Python34\lib\wsgiref\handlers.py",line138,inrun self.finish_response() File"C:\Python34\lib\wsgiref\handlers.py",line181,infinish_response self.write(data) File"C:\Python34\lib\wsgiref\handlers.py",line267,inwrite "write()argumentmustbeabytesinstance" AssertionError:write()argumentmustbeabytesinstance Duringhandlingoftheaboveexception,anotherexceptionoccurred: Traceback(mostrecentcalllast): File"C:\Python34\lib\wsgiref\handlers.py",line141,inrun self.handle_error() File"C:\Python34\lib\wsgiref\handlers.py",line369,inhandle_error self.finish_response() File"C:\Python34\lib\wsgiref\handlers.py",line181,infinish_response self.write(data) File"C:\Python34\lib\wsgiref\handlers.py",line275,inwrite self.send_headers() File"C:\Python34\lib\wsgiref\handlers.py",line332,insend_headers ifnotself.origin_serverorself.client_is_modern(): File"C:\Python34\lib\wsgiref\handlers.py",line345,inclient_is_modern returnself.environ['SERVER_PROTOCOL'].upper()!='HTTP/0.9' TypeError:'NoneType'objectisnotsubscriptable Duringhandlingoftheaboveexception,anotherexceptionoccurred: Traceback(mostrecentcalllast): ---------------------------------------- Exceptionhappenedduringprocessingofrequestfrom('127.0.0.1',60566) File"C:\Python34\lib\socketserver.py",line305,in_handle_request_noblock self.process_request(request,client_address) File"C:\Python34\lib\socketserver.py",line331,inprocess_request self.finish_request(request,client_address) File"C:\Python34\lib\socketserver.py",line344,infinish_request self.RequestHandlerClass(request,client_address,self) File"C:\Python34\lib\socketserver.py",line673,in__init__ self.handle() File"C:\Python34\lib\wsgiref\simple_server.py",line133,inhandle handler.run(self.server.get_app()) File"C:\Python34\lib\wsgiref\handlers.py",line144,inrun self.close() File"C:\Python34\lib\wsgiref\simple_server.py",line35,inclose self.status.split('',1)[0],self.bytes_sent AttributeError:'NoneType'objecthasnoattribute'split' ---------------------------------------- ---------------------------------------- Exceptionhappenedduringprocessingofrequestfrom('127.0.0.1',60568) ---------------------------------------- 127.0.0.1--[12/Apr/201616:44:18]"GET/HTTP/1.1"2000 Traceback(mostrecentcalllast): File"C:\Python34\lib\wsgiref\handlers.py",line138,inrun self.finish_response() File"C:\Python34\lib\wsgiref\handlers.py",line181,infinish_response self.write(data) File"C:\Python34\lib\wsgiref\handlers.py",line267,inwrite "write()argumentmustbeabytesinstance" AssertionError:write()argumentmustbeabytesinstance 127.0.0.1--[12/Apr/201616:44:18]"GET/HTTP/1.1"50059 Traceback(mostrecentcalllast): File"C:\Python34\lib\wsgiref\handlers.py",line138,inrun self.finish_response() File"C:\Python34\lib\wsgiref\handlers.py",line181,infinish_response self.write(data) File"C:\Python34\lib\wsgiref\handlers.py",line267,inwrite "write()argumentmustbeabytesinstance" AssertionError:write()argumentmustbeabytesinstance Duringhandlingoftheaboveexception,anotherexceptionoccurred: Traceback(mostrecentcalllast): File"C:\Python34\lib\wsgiref\handlers.py",line141,inrun self.handle_error() File"C:\Python34\lib\wsgiref\handlers.py",line369,inhandle_error self.finish_response() File"C:\Python34\lib\wsgiref\handlers.py",line181,infinish_response self.write(data) File"C:\Python34\lib\wsgiref\handlers.py",line275,inwrite self.send_headers() File"C:\Python34\lib\wsgiref\handlers.py",line332,insend_headers ifnotself.origin_serverorself.client_is_modern(): File"C:\Python34\lib\wsgiref\handlers.py",line345,inclient_is_modern returnself.environ['SERVER_PROTOCOL'].upper()!='HTTP/0.9' TypeError:'NoneType'objectisnotsubscriptable Duringhandlingoftheaboveexception,anotherexceptionoccurred: Traceback(mostrecentcalllast): File"C:\Python34\lib\socketserver.py",line305,in_handle_request_noblock self.process_request(request,client_address) File"C:\Python34\lib\socketserver.py",line331,inprocess_request self.finish_request(request,client_address) File"C:\Python34\lib\socketserver.py",line344,infinish_request self.RequestHandlerClass(request,client_address,self) File"C:\Python34\lib\socketserver.py",line673,in__init__ self.handle() File"C:\Python34\lib\wsgiref\simple_server.py",line133,inhandle handler.run(self.server.get_app()) File"C:\Python34\lib\wsgiref\handlers.py",line144,inrun self.close() File"C:\Python34\lib\wsgiref\simple_server.py",line35,inclose self.status.split('',1)[0],self.bytes_sent AttributeError:'NoneType'objecthasnoattribute'split'
猛地一看,这么多报错,一下就蒙圈了,各种google百度,各种查,google到时能查到一些,
但是英文不好,也看不太明白,百度查到的都是垃圾,根本就没用,最后硬着头皮,一点一点看源码。
首先,根据第一行的提示:
File"C:\Python34\lib\wsgiref\handlers.py",line138,inrun self.finish_response()
我这里用的编辑器是pycharm,找到handlers.py文件的138行,按住ctrl点击文件中的finish_response()方法,
就找到self.finish_response()定义的位置了。根据第二条提示:
File"C:\Python34\lib\wsgiref\handlers.py",line181,infinish_response self.write(data)
发现是write方法出现错误,再按住ctrl点击write方法,找到定义write方法的位置,发现第一行就定义了一条报错:
asserttype(data)isbytes,\ "write()argumentmustbeabytesinstance"
对照上面的报错信息,发现可能是变量data的类型,不是bytes,所以在handlers.py181行代码self.write(data)上面加一句:
data=data.encode(),再次刷新程序,发现所有报错居然都没了,程序正常运行。
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