使用WSGI提供html时出错

概述我正在尝试创建一个为用户提供简单 HTML表单的应用程序,然后在用户提交表单时调用函数.它使用wsgiref.simple_server来提供HTML.服务器遇到错误,我不明白为什么.代码如下： #!/usr/bin/python3from wsgiref.simple_server import make_serverfrom wsgiref.util import setup_testin 我正在尝试创建一个为用户提供简单 HTML表单的应用程序,然后在用户提交表单时调用函数.它使用wsgiref.simple_server来提供HTML.服务器遇到错误,我不明白为什么.代码如下：

#!/usr/bin/python3from wsgiref.simple_server import make_serverfrom wsgiref.util import setup_testing_defaultsimport webbrowser # open user's web browser to url when server is runfrom sys import exc_infofrom traceback import format_tb# Easily serves an HTML form at path_to_index with style at path_to_style# Calls on_submit when the form is submitted,passing a dictionary with key# value pairs { "input name" : submitted_value }class SimpleServer:    def __init__(self,port=8000,on_submit=None,index_path="./index.HTML",CSS_path="./style.CSS"):        self.port = port        self.on_submit = on_submit        self.index_path = index_path        self.CSS_path = CSS_path    # Forwards request to proper method,or returns 404 page    def wsgi_app(self,environ,start_response):        urls = [            (r"^$",self.index),(r"404$",self.error_404),(r"style.CSS$",self.CSS)        ]        path = environ.get("PATH_INFO","").lstrip("/")        # Call another application if they called a path defined in urls        for regex,application in urls:            match = re.search(regex,path)            # if the match was found,return that page            if match:                environ["myapp.url_args"] = match.groups()                return application(environ,start_response)        return error_404(environ,start_response)    # Gives the user a form to submit all their input. If the form has been     # submitted,it sends the ouput of self.on_submit(user_input)    def index(self,start_response):        # user_input is a dictionary,with keys from the names of the fIElds        user_input = parse_qs(environ['query_STRING'])        # return either the form or the calculations        index_HTML = open(self.index_path).read()        body = index_HTML if user_input == {} else calculate(user_input)        mime_type = "text/HTML" if user_input == {} else "text/plain"        # return the body of the message        status = "200 OK"        headers = [ ("Content-Type",mime_type),("Content-Length",str(len(body))) ]        start_response(status,headers)        return [body.encode("utf-8")]    def start_form(self):        httpd = make_server('',self.port,ExceptionMIDdleware(self.wsgi_app))        url = "http://localhost:" + str(self.port)        print("Visit " + url)        # webbrowser.open(url)        httpd.serve_forever()if __name__ == "__main__":    server = SimpleServer()    server.start_form()

当我运行它时,我得到了错误

127.0.0.1 - - [16/Dec/2014 21:15:57] "GET / http/1.1" 500 0Traceback (most recent call last):  @R_301_6852@ "/usr/lib/python3.4/wsgiref/handlers.py",line 138,in run    self.finish_response()  @R_301_6852@ "/usr/lib/python3.4/wsgiref/handlers.py",line 180,in finish_response    self.write(data)  @R_301_6852@ "/usr/lib/python3.4/wsgiref/handlers.py",line 266,in write    "write() argument must be a bytes instance"AssertionError: write() argument must be a bytes instance127.0.0.1 - - [16/Dec/2014 21:15:57] "GET / http/1.1" 500 59----------------------------------------Exception happened during processing of request from ('127.0.0.1',49354)Traceback (most recent call last):  @R_301_6852@ "/usr/lib/python3.4/wsgiref/handlers.py",in write    "write() argument must be a bytes instance"AssertionError: write() argument must be a bytes instanceDuring handling of the above exception,another exception occurred:Traceback (most recent call last):  @R_301_6852@ "/usr/lib/python3.4/wsgiref/handlers.py",line 141,in run    self.handle_error()  @R_301_6852@ "/usr/lib/python3.4/wsgiref/handlers.py",line 368,in handle_error    self.finish_response()  @R_301_6852@ "/usr/lib/python3.4/wsgiref/handlers.py",line 274,in write    self.send_headers()  @R_301_6852@ "/usr/lib/python3.4/wsgiref/handlers.py",line 331,in send_headers    if not self.origin_server or self.clIEnt_is_modern():  @R_301_6852@ "/usr/lib/python3.4/wsgiref/handlers.py",line 344,in clIEnt_is_modern    return self.environ['SERVER_PROTOCol'].upper() != 'http/0.9'TypeError: 'nonetype' object is not subscriptableDuring handling of the above exception,another exception occurred:Traceback (most recent call last):  @R_301_6852@ "/usr/lib/python3.4/socketserver.py",line 305,in _handle_request_noblock    self.process_request(request,clIEnt_address)  @R_301_6852@ "/usr/lib/python3.4/socketserver.py",in process_request    self.finish_request(request,in finish_request    self.RequestHandlerClass(request,clIEnt_address,self)  @R_301_6852@ "/usr/lib/python3.4/socketserver.py",line 669,in __init__    self.handle()  @R_301_6852@ "/usr/lib/python3.4/wsgiref/simple_server.py",line 133,in handle    handler.run(self.server.get_app())  @R_301_6852@ "/usr/lib/python3.4/wsgiref/handlers.py",line 144,in run    self.close()  @R_301_6852@ "/usr/lib/python3.4/wsgiref/simple_server.py",line 35,in close    self.status.split(' ',1)[0],self.bytes_sentAttributeError: 'nonetype' object has no attribute 'split'

此输出实际上不包括我正在运行的脚本,我很困惑.有什么想法吗？

解决方法 只是为这个问题注册解决方案,问题在于len()函数.

STR(LEN(本体))

它计算错误的大小,当返回服务器Content-Length时,它等待所需的更多字节.

因此,总是使用UTF-8缓冲区发送字节,例如：

from io import StringIOstdout = StringIO()print("Hello World!",@R_301_6852@=stdout)start_response("200 OK",[('Content-Type','text/plain; charset=utf-8')])return [stdout.getvalue().encode("utf-8")]

总结

以上是内存溢出为你收集整理的使用WSGI提供html时出错全部内容，希望文章能够帮你解决使用WSGI提供html时出错所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。