Python 庫生成的 HTTP 請求消息中的HTTP/1.1 強制 Host 頭字段在哪里？requestsimport requestsresponse = requests.get("https://www.google.com/")print(response.request.headers)輸出：{'User-Agent': 'python-requests/2.22.0', 'Accept-Encoding': 'gzip, deflate', 'Accept': '*/*', 'Connection': 'keep-alive'}
1 回答
MM們
TA貢獻(xiàn)1886條經(jīng)驗 獲得超2個贊
默認(rèn)情況下，HOST標(biāo)頭不會添加到請求中requests。如果沒有明確添加，則將決策委托給底層http模塊。
請參閱以下部分http/client.py：
（如果在then is'Host'中明確提供了標(biāo)題）requests.getskip_hostTrue
if self._http_vsn == 11:
# Issue some standard headers for better HTTP/1.1 compliance
if not skip_host:
# this header is issued *only* for HTTP/1.1
# connections. more specifically, this means it is
# only issued when the client uses the new
# HTTPConnection() class. backwards-compat clients
# will be using HTTP/1.0 and those clients may be
# issuing this header themselves. we should NOT issue
# it twice; some web servers (such as Apache) barf
# when they see two Host: headers
# If we need a non-standard port,include it in the
# header. If the request is going through a proxy,
# but the host of the actual URL, not the host of the
# proxy.
netloc = ''
if url.startswith('http'):
nil, netloc, nil, nil, nil = urlsplit(url)
if netloc:
try:
netloc_enc = netloc.encode("ascii")
except UnicodeEncodeError:
netloc_enc = netloc.encode("idna")
self.putheader('Host', netloc_enc)
else:
if self._tunnel_host:
host = self._tunnel_host
port = self._tunnel_port
else:
host = self.host
port = self.port
try:
host_enc = host.encode("ascii")
except UnicodeEncodeError:
host_enc = host.encode("idna")
# As per RFC 273, IPv6 address should be wrapped with []
# when used as Host header
if host.find(':') >= 0:
host_enc = b'[' + host_enc + b']'
if port == self.default_port:
self.putheader('Host', host_enc)
else:
host_enc = host_enc.decode("ascii")
self.putheader('Host', "%s:%s" % (host_enc, port))
因此，'Host'在檢查requests發(fā)送到服務(wù)器的標(biāo)頭時，我們看不到標(biāo)頭。
如果我們向http://httpbin/get發(fā)送請求并打印響應(yīng)，我們可以看到Host標(biāo)頭確實已發(fā)送。
import requests
response = requests.get("http://httpbin.org/get")
print('Response from httpbin/get')
print(response.json())
print()
print('response.request.headers')
print(response.request.headers)
輸出
Response from httpbin/get
{'args': {}, 'headers': {'Accept': '*/*', 'Accept-Encoding': 'gzip, deflate',
'Host': 'httpbin.org', 'User-Agent': 'python-requests/2.20.0'},
'origin': 'XXXXXX', 'url': 'https://httpbin.org/get'}
response.request.headers
{'User-Agent': 'python-requests/2.20.0', 'Accept-Encoding': 'gzip, deflate',
'Accept': '*/*', 'Connection': 'keep-alive'}
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