Errors and Server HTTP Response Header Codes

You can view the HTTP response and program codes for URLs after the website scan has finished:



For a full list of possible codes and their explanations, see the table below:

Code	Description	More Info
HTTP Response Codes
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	The URL redirects to another. To find out where you linked/used/etc. this URL, see internal linking.
302	Moved Temporarily (Found)
303	See Other
304	Not Modified
305	Use Proxy
306	Switch Proxy
307	Temporary Redirect
400	Bad Request	See rcTimeoutConnect: Timeout: Generic for possible cause and solution.
401	Unauthorized	Website may require login or similar.
402	Payment Required
403	Forbidden	See rcTimeoutConnect: Timeout: Generic for possible cause and solution. Possibly a server module denying unknown crawlers access. See help on problematic websites.
404	Not Found	The URL does not exist. To find out where you linked/used/etc. this URL, see internal linking.
405	Method Not Allowed
406	Not Acceptable
407	Proxy Authentication Required
408	Request Timeout
409	Conflict
410	Gone
411	Length Required
412	Precondition Failed
413	Request Entity Too Large
414	Request-URI Too Long
415	Unsupported Media Type
416	Requested Range Not Satisfiable
417	Expectation Failed
500	Internal Server Error	See rcTimeoutConnect: Timeout: Generic for possible cause and solution.
503	Service Temporarily Unavailable	See rcTimeoutConnect: Timeout: Generic for possible cause and solution.
504	Gateway Timeout
505	HTTP Version Not Supported
A1 Website Analyzer Response Codes
0	rcVirtualItem: Virtual Item	No request has been done by the crawler for this URL. Happens in cases where a directory example/ is not used, linked or redirected from anywhere (and thus with default settings not crawled), but has URLs underneath that are, e.g. example/file.html. If there are no URLs underneath like described above - rcVirtualItem URLs will not appear in Analyze website data. Alternatively, you can force the crawler to handle such URLs by checking option: Scan website | Crawler options | Always scan directories that contain linked URLs. For more details, see the internal linking help page.
-1	rcNoRequest: No Request	No request has been done by the crawler for this URL. You will usually only see this under the following conditions: The URL is excluded in both analysis filters and output filters or alternatively disallowed by robots.txt . You have unchecked: Older versions: Scan website | Crawler options | Apply "webmaster" and "output" filters after website scan stops Newer versions: Scan website | Output filters | After website scan stops: Remove URLs excluded Scan website | Webmaster filters | After website scan stops: Remove URLs with noindex/disallow
-2	rcUnknownResult: Unknown Result	Server responded with an unrecognized response code.
-3	rcTimeoutGeneric: Timeout: Generic	Possible solutions if you have overloaded your server: 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 or HTTPS protocol. The server/domain of the URL did not exist. Firewall or similar is blocking connections.
-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	Possible reasons: The server/domain of the URL did not exist. Could be a problem with DNS.
-11	rcMetaRefreshRedirect: Meta Refresh Redirect	Duplicate URLs
-12	rcCommErrorChunkedWrong: Communication Error: Chunked Wrong
-13	rcAjaxSnapshotRedirect: Redirect: Ajax Snapshot Redirect	Google proposed AJAX snapshot solution where example.com/ajax.html#!key=value corresponds to example.com/ajax.html?_escaped_fragment_=key=value AJAX is a Javascript/browser technology that allows Javascript to communicate directly with a server through HTTP. This allows JS to update the browser content without any page reloads.
-14	rcRedirectNoSlashDirRoot: Redirect: No Slash Directory Root	Duplicate URLs

The usage of some of the program specific codes is controlled by the option: Scan website | Crawler options | Use special "response" codes for when page URLs use canonical or similar.

This option is unchecked by default for new projects in A1 Website Analyzer since this software shows extended information in the data columns URL Flags and Crawler Flags which can be used in conjunction with SEO reports and other data columns.

After a website scan has finished, you can see all URLs found in the analyze website tab.

You can see the state of the URLs by their icons:

• : Server response 200 - OK.
• : Server error response code, e.g. 404 - Not Found.
• : Server HTTP response code never checked or unknown.

For details about an URL, just view the R.Code (response code) column value.

The term Soft 404 errors is a situation where a website should return response code 404 : Not Found for an URL, but instead returns 200 : Found.

If you want to detect such URLs, use the custom search feature to search for the text and code specific to pages showing a soft error.

When scanning a complete website, some URLs may result in a standard HTTP error response code, and other URLs may simply error in different manner, e.g. through connect or read timeouts.

Some common examples are:

• 500 : Internal Server Error, 503 : Service Temporarily Unavailable and -4 : CommError:
  These are reported when a complete connection failure happens. These can e.g. be caused by firewall issues.
• 404 : Not Found:
  To solve broken links, read the help page about internal linking.

To solve more kinds of issues including server error HTTP response codes see:

• How to use resume scan to re-check / re-crawl URLs that errored during the first site crawl.
• All about how to ensure all links are found and solve all errors when crawling websites.
• How to adjust speed and resource usage when crawling large websites.
• Guides on how to solve problematic websites and website platforms.