我应该如何配置我的标头以对 APNs 进行 HTTP/2 POST 以避免“收到重复的伪标头字段”错误？

Posted 2023-03-10

【中文标题】我应该如何配置我的标头以对 APNs 进行 HTTP/2 POST 以避免“收到重复的伪标头字段”错误？

【英文标题】：How should I configure my headers to make an HTTP/2 POST to APNs to avoid "Received duplicate pseudo-header field" error?

【发布时间】：2021-03-26 13:56:46

【问题描述】：

我对 HTTP 的东西还很陌生，主要是使用 ios，所以请多多包涵。 我正在使用 httpx python 库尝试向 iPhone 发送通知，因为我必须进行 HTTP/2 POST 才能这样做。 Apple 的文档说它需要 ":method" 和 ":path" 标头，但是当我尝试使用包含这些标头的 POST 时，

headers =  
    ':method' : 'POST', 
    ':path' : '/3/device/'.format(deviceToken),  
    ...
    

我得到了错误

h2.exceptions.ProtocolError: 收到重复的伪头字段 b':path

很明显，包含“:path”标头存在问题，但我还需要发送它，所以我不确定我做错了什么。苹果的文档也说

将 :path 和授权值编码为文字标头字段，无需索引。

将所有其他字段编码为带有增量索引的文字标题字段。

我真的不知道这意味着什么，也不知道如何实现，或者它是否相关。我认为 httpx 会将我的 ":path" 标头与默认标头合并以消除重复，但我只是在这里吐口水。

完整的追溯

File "/Users/User/.pyenv/versions/3.9.0/lib/python3.9/site-packages/httpx/_client.py", line 992, in post
    return self.request(
  File "/Users/User/.pyenv/versions/3.9.0/lib/python3.9/site-packages/httpx/_client.py", line 733, in request
    return self.send(
  File "/Users/User/.pyenv/versions/3.9.0/lib/python3.9/site-packages/httpx/_client.py", line 767, in send
    response = self._send_handling_auth(
  File "/Users/User/.pyenv/versions/3.9.0/lib/python3.9/site-packages/httpx/_client.py", line 805, in _send_handling_auth
    response = self._send_handling_redirects(
  File "/Users/User/.pyenv/versions/3.9.0/lib/python3.9/site-packages/httpx/_client.py", line 837, in _send_handling_redirects
    response = self._send_single_request(request, timeout)
  File "/Users/User/.pyenv/versions/3.9.0/lib/python3.9/site-packages/httpx/_client.py", line 861, in _send_single_request
    (status_code, headers, stream, ext) = transport.request(
  File "/Users/User/.pyenv/versions/3.9.0/lib/python3.9/site-packages/httpcore/_sync/connection_pool.py", line 218, in request
    response = connection.request(
  File "/Users/User/.pyenv/versions/3.9.0/lib/python3.9/site-packages/httpcore/_sync/connection.py", line 106, in request
    return self.connection.request(method, url, headers, stream, ext)
  File "/Users/User/.pyenv/versions/3.9.0/lib/python3.9/site-packages/httpcore/_sync/http2.py", line 119, in request
    return h2_stream.request(method, url, headers, stream, ext)
  File "/Users/User/.pyenv/versions/3.9.0/lib/python3.9/site-packages/httpcore/_sync/http2.py", line 292, in request
    self.send_headers(method, url, headers, has_body, timeout)
  File "/Users/User/.pyenv/versions/3.9.0/lib/python3.9/site-packages/httpcore/_sync/http2.py", line 330, in send_headers
    self.connection.send_headers(self.stream_id, headers, end_stream, timeout)
  File "/Users/User/.pyenv/versions/3.9.0/lib/python3.9/site-packages/httpcore/_sync/http2.py", line 227, in send_headers
    self.h2_state.send_headers(stream_id, headers, end_stream=end_stream)
  File "/Users/User/.pyenv/versions/3.9.0/lib/python3.9/site-packages/h2/connection.py", line 770, in send_headers
    frames = stream.send_headers(
  File "/Users/User/.pyenv/versions/3.9.0/lib/python3.9/site-packages/h2/stream.py", line 865, in send_headers
    frames = self._build_headers_frames(
  File "/Users/User/.pyenv/versions/3.9.0/lib/python3.9/site-packages/h2/stream.py", line 1252, in _build_headers_frames
    encoded_headers = encoder.encode(headers)
  File "/Users/User/.pyenv/versions/3.9.0/lib/python3.9/site-packages/hpack/hpack.py", line 249, in encode
    for header in headers:
  File "/Users/User/.pyenv/versions/3.9.0/lib/python3.9/site-packages/h2/utilities.py", line 496, in inner
    for header in headers:
  File "/Users/User/.pyenv/versions/3.9.0/lib/python3.9/site-packages/h2/utilities.py", line 441, in _validate_host_authority_header
    for header in headers:
  File "/Users/User/.pyenv/versions/3.9.0/lib/python3.9/site-packages/h2/utilities.py", line 338, in _reject_pseudo_header_fields
    raise ProtocolError(
h2.exceptions.ProtocolError: Received duplicate pseudo-header field b':method'

请求：

devServer = "https://api.sandbox.push.apple.com:443"
title = "some title"
notification =  "aps":  "alert": title, "sound": "someSound.caf"  
client = httpx.Client(http2=True)
try:
    r = client.post(devServer, json=notification, headers=headers)
finally:
    client.close()

【问题讨论】：

你的 http 请求调用是什么样的？

@C.Nivs 将其添加到我的问题中。

把“:path”和“:method”从你的头文件中取出——httpx，通过http2，自动把它们放进去。 （我使用或多或少相同的代码，减去那些标题！）

@Sebastian 那么如何在没有“:path”标头的情况下传入设备令牌？我想我可以不用“：方法”，因为可以推断出 POST，但我只是不确定如何传递设备令牌信息......

@Jake 将路径放入您传递给 post 函数的 URL 中。现在，您只需输入devServer，而是将其设置为：'/3/device/'.format(devServer, deviceToken)

【参考方案1】：

只需将'/3/device/'.format(deviceToken)附加到devServer url作为路径，“:path”伪标头就会自动设置到它。

也就是说，

devServer = 'https://api.sandbox.push.apple.com:443/3/device/'.format(deviceToken) 

解释：

“:path”、“:method”和“:scheme”pseudo-headers一般不需要在http2中手动添加

参考：Hypertext Transfer Protocol Version 2 (HTTP/2)