我正在使用 Python Flask 通过 FCGI 和 nginx 运行 Python for web。我的 fcgi 后端是这样设置的:
#!/usr/bin/env python
import argparse, daemon, os
from flup.server.fcgi import WSGIServer
from fwd_msg import app
SOCKET_LOCATION = '/tmp/fingerprinter-fcgi.sock'
if __name__ == '__main__':
# arg parse (and daemonize)
arg_parser = argparse.ArgumentParser()
arg_parser.add_argument('--daemon', action='store_true', default=False, help='Run as daemon')
arg_parser.add_argument('--cwd', action='store', default='/',
help='Full path of the working directory to which the process should change on daemon start.')
arg_parser.add_argument('--uid', action='store', type=int, default=os.getuid(),
help='The user ID ("UID") value and group ID ("GID") value to switch the process to on daemon start.')
args = vars(arg_parser.parse_args())
if args['daemon']:
context = daemon.DaemonContext(working_directory=args['cwd'], uid=args['uid'])
with context:
WSGIServer(app, bindAddress=SOCKET_LOCATION).run()
else:
WSGIServer(app, bindAddress=SOCKET_LOCATION).run()
如果我在没有 daemon 参数的情况下运行 WSGIServer,它工作正常。
但是,如果我使用 daemon 参数运行它,我会在 nginx 日志中收到此错误,而对服务器的任何请求都以“502 BAD GATEWAY”结尾:
2012/05/09 12:16:00 [error] 30895#0: *30 upstream sent unsupported FastCGI protocol version: 91 while reading response header from upstream, client: XXX.XXX.XXX.XXX, server: localhost, request: "POST / HTTP/1.1", upstream: "fastcgi://unix:/tmp/fingerprinter-fcgi.sock:", host: "XXX.XXX.XXX.XXX"
任何想法为什么会发生这种情况以及如何防止它?