List of HTTP Response Codes and Errors in Server Response Headers

Abstract: Complete list of HTTP response codes a server can send in response headers to requests made by crawlers and internet browsers.
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HTTP Response Codes Server Can Send in HTTP Headers

Code	Description	More Info
100	Continue
101	Switching Protocols
200	OK
201	Created
202	Accepted
203	Non-Authoritative Information
204	No Content
205	Reset Content
206	Partial Content
300	Multiple Choices
301	Moved Permanently
302	Moved Temporarily (Found)
303	See Other
304	Not Modified
305	Use Proxy
306	Switch Proxy
307	Temporary Redirect
400	Bad Request
401	Unauthorized
402	Payment Required
403	Forbidden
404	Not Found
500	Internal Server Error
503	Service Temporarily Unavailable
A1 Sitemap Generator Response Codes
0	rcVirtualItem: Virtual Item	Internal Linking
-1	rcNoRequest: No Request	No request has been done by crawler.
-2	rcUnknownResult: Unknown Result	Server responded with an unrecognized response code.
-3	rcTimeoutGeneric: Timeout: Generic	Possible solutions: Lower amount of simultaneous connections. Increase timeout values. Increase connection retries. Resume scan. Crawler will attempt connect again.
-4	rcCommError: Communication Error	Possible reasons: Webserver did not obey HTTP protocol. The server/domain of the URL did not exist.
-5	rcTimeoutConnect: Timeout: Connect	See rcTimeoutConnect: Timeout: Generic
-6	rcTimeoutRead: Timeout: Read	See rcTimeoutConnect: Timeout: Generic
-7	rcCommErrorDecompress: Communication Error: Decompress
-8	rcRedirectCanonical: Redirect: Canonical	Canonical URLs
-9	rcRedirectIndexFileDirRoot: Redirect: Index File Directory Root	Duplicate URLs
-10	rcCommErrorSocket: Communication Error Sockets
-11	rcMetaRefreshRedirect: Meta Refresh Redirect	Duplicate URLs