这是代理协议信息的示例：
如果服务器不支持该协议，他们是否可以正确解析包含代理协议标头的 TCP/HTTP 有效负载？
这取决于服务器实现。
例如，我尝试向 python 的 HTTPServer 发送代理协议信息，它抛出了 400 错误代码。这是解析标头的服务器的实现：
def parse_request(self):
"""Parse a request (internal).
The request should be stored in self.raw_requestline; the results
are in self.command, self.path, self.request_version and
self.headers.
Return True for success, False for failure; on failure, an
error is sent back.
"""
self.command = None # set in case of error on the first line
self.request_version = version = self.default_request_version
self.close_connection = 1
requestline = self.raw_requestline
requestline = requestline.rstrip('\r\n')
self.requestline = requestline
words = requestline.split()
if len(words) == 3:
command, path, version = words
if version[:5] != 'HTTP/':
self.send_error(400, "Bad request version (%r)" % version)
return False
try:
base_version_number = version.split('/', 1)[1]
version_number = base_version_number.split(".")
# RFC 2145 section 3.1 says there can be only one "." and
# - major and minor numbers MUST be treated as
# separate integers;
# - HTTP/2.4 is a lower version than HTTP/2.13, which in
# turn is lower than HTTP/12.3;
# - Leading zeros MUST be ignored by recipients.
if len(version_number) != 2:
raise ValueError
version_number = int(version_number[0]), int(version_number[1])
except (ValueError, IndexError):
self.send_error(400, "Bad request version (%r)" % version)
return False
if version_number >= (1, 1) and self.protocol_version >= "HTTP/1.1":
self.close_connection = 0
if version_number >= (2, 0):
self.send_error(505,
"Invalid HTTP Version (%s)" % base_version_number)
return False
elif len(words) == 2:
command, path = words
self.close_connection = 1
if command != 'GET':
self.send_error(400,
"Bad HTTP/0.9 request type (%r)" % command)
return False
elif not words:
return False
else:
self.send_error(400, "Bad request syntax (%r)" % requestline)
return False
self.command, self.path, self.request_version = command, path, version
# Examine the headers and look for a Connection directive
self.headers = self.MessageClass(self.rfile, 0)
conntype = self.headers.get('Connection', "")
if conntype.lower() == 'close':
self.close_connection = 1
elif (conntype.lower() == 'keep-alive' and
self.protocol_version >= "HTTP/1.1"):
self.close_connection = 0
return True
请注意，代理协议有效负载例如：
代理 TCP4 192.168.73.178 192.168.73.185 52406 80
包含 6 个单词。如果标头有 3,2 或没有单词，这个特定的服务器实现会处理请求。否则会抛出 400 错误代码。
else:
self.send_error(400, "Bad request syntax (%r)" % requestline)
return False
而当我尝试将相同的信息发送到具有相同 HAProxy 配置的 tomcat 服务器时，它只是忽略了有效负载。
一般来说，除非我知道它能够明确地处理它，否则我会谨慎行事并且不发送代理信息。