http 常见状态码

X-Crawlera-Error Response Code Error Message
bad_session_id 400 Incorrect session ID
user_session_limit 400 Session limit exceeded
bad_auth 401 Unauthorized mashape request
bad_auth 407  
too_many_conns 429 Too many connections*
header_auth 470 Unauthorized Crawlera header
  500 Unexpected error
nxdomain 502 Error looking up domain
econnrefused 502 Connection refused
econnreset 502 Connection reset
socket_closed_remotely 502 Server closed socket connection
send_failed 502 Send failed
noslaves 503 No available proxies
slavebanned 503 Website crawl ban
serverbusy 503 Server busy: too many outstanding requests
timeout 504 Timeout from upstream server
msgtimeout 504 Timeout processing HTTP stream
domain_forbidden 523 Domain forbidden. Please contact support@scrapinghub.com
bad_header 540 Bad header value for 

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