使用BaseHTTPRequestHand从POST请求接收二进制文件

Question

我一直在试用this forum中的一些代码。到目前为止，它还可以接收curl POST请求中传递的json片段，但我现在正试图向它发送一个小的.jpg文件。它同时在几个方面失败了，但我对这些问题中的第一个是如何产生的感到困惑。在

我的代码如下：

from http.server import BaseHTTPRequestHandler, HTTPServer
from urllib.parse import parse_qs
from cgi import parse_header, parse_multipart

class ReportHandler(BaseHTTPRequestHandler):
    def do_HEAD(self):
        self.send_response(200)
        self.send_header("Content-type", "text/html")
        self.end_headers()

    def parse_POST(self):
        print(self.headers)
        ctype, pdict = parse_header(self.headers['content-type'])
        print("ctype", ctype, ctype == 'application/octet-stream')
        print(pdict)
        if ctype == 'multipart/form-data':
            postvars = parse_multipart(self.rfile, pdict)
        elif ctype == 'application/x-www-form-urlencoded' or 'application/json':   
            print("here!")
            length = int(self.headers['content-length'])
            postvars = parse_qs(
                self.rfile.read(length).decode('utf8'),
                keep_blank_values=1)
            print(postvars)
        elif ctype == 'application/octet-stream':
            print("octet stream header")

        else:
            print("nothing")
            postvars = {}
            a = self.rfile
            print(dir(a))
            print(a.peek())
        return postvars

    def do_POST(self):
        postvars = self.parse_POST()
        print(postvars)
        self.send_response(200)
        self.send_header('Content-type', 'text/html')
        self.end_headers()



def main():
    server = HTTPServer(('', 8088), ReportHandler)
    try:
        print('Started http server')
        server.serve_forever()
    except keyboardInterrupt:
        print('^C received, shutting down server')
        server.socket.close()

if __name__ == "__main__":
    main()

然后我在另一个终端中发出一个curl命令，如下所示：

^{pr2}$

它返回以下输出和错误跟踪：

python receive_requests.py 
Started http server
Host: 127.0.0.1:8088
User-Agent: curl/7.52.1
Accept: */*
Content-Type: application/octet-stream
Content-Length: 16687
Expect: 100-continue


ctype application/octet-stream True
{}
here!
----------------------------------------
Exception happened during processing of request from ('127.0.0.1', 52056)
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/socketserver.py", line 317, in _handle_request_noblock
    self.process_request(request, client_address)
  File "/usr/local/lib/python3.6/socketserver.py", line 348, in process_request
    self.finish_request(request, client_address)
  File "/usr/local/lib/python3.6/socketserver.py", line 361, in finish_request
    self.RequestHandlerClass(request, client_address, self)
  File "/usr/local/lib/python3.6/socketserver.py", line 721, in __init__
    self.handle()
  File "/usr/local/lib/python3.6/http/server.py", line 418, in handle
    self.handle_one_request()
  File "/usr/local/lib/python3.6/http/server.py", line 406, in handle_one_request
    method()
  File "receive_requests.py", line 42, in do_POST
    postvars = self.parse_POST()
  File "receive_requests.py", line 27, in parse_POST
    self.rfile.read(length).decode('utf8'),
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 0: invalid start byte
----------------------------------------

所以编码有一个错误，但我真正想知道的是它是如何结束的：

elif ctype == 'application/x-www-form-urlencoded' or 'application/json':

……尽管如此

print("ctype", ctype, ctype == 'application/octet-stream')

给予

>>> ctype application/octet-stream True

如果有人知道如何修复此代码以便它接收二进制文件，请将其发布，否则它如何设法转到错误的elif选项？有没有关于头部或卷曲的行为，我遗漏了？在

Answer 1

你的情况总是会变为真。非空字符串的计算结果为True：

elif ctype == 'application/x-www-form-urlencoded' or 'application/json':

它应该是：

^{pr2}$

或者

elif ctype in ('application/x-www-form-urlencoded', 'application/json'):