Often when debugging a problem or looking through your logs you will see the apache status codes
For Example
xxx.xxx.xxx.xxx - - [28/Jul/2006:13:49:28 +0200] "GET /news.php HTTP/1.1" 200 807 "http://www.joe-ma.co.za/news.php" "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9a1) Gecko/20060703 FreeBSD/amd64 Minefield/3.0a1"
Successful Client Requests
200 OK
201 Created
202 Accepted
203 Non-Authorative Information
204 No Content
205 Reset Content
206 Partial Content
Client Request Redirected
300 Multiple Choices
301 Moved Permanently
302 Moved Temporarily
303 See Other
304 Not Modified
305 Use Proxy
Client Request Errors
400 Bad Request
401 Authorization Required
402 Payment Required (not used yet)
403 Forbidden
404 Not Found
405 Method Not Allowed
406 Not Acceptable (encoding)
407 Proxy Authentication Required
408 Request Timed Out
409 Conflicting Request
410 Gone
411 Content Length Required
412 Precondition Failed
413 Request Entity Too Long
414 Request URI Too Long
415 Unsupported Media Type
Server Errors
500 Internal Server Error
501 Not Implemented
502 Bad Gateway
503 Service Unavailable
504 Gateway Timeout
505 HTTP Version Not Supported
For Example
xxx.xxx.xxx.xxx - - [28/Jul/2006:13:49:28 +0200] "GET /news.php HTTP/1.1" 200 807 "http://www.joe-ma.co.za/news.php" "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9a1) Gecko/20060703 FreeBSD/amd64 Minefield/3.0a1"
Successful Client Requests
200 OK
201 Created
202 Accepted
203 Non-Authorative Information
204 No Content
205 Reset Content
206 Partial Content
Client Request Redirected
300 Multiple Choices
301 Moved Permanently
302 Moved Temporarily
303 See Other
304 Not Modified
305 Use Proxy
Client Request Errors
400 Bad Request
401 Authorization Required
402 Payment Required (not used yet)
403 Forbidden
404 Not Found
405 Method Not Allowed
406 Not Acceptable (encoding)
407 Proxy Authentication Required
408 Request Timed Out
409 Conflicting Request
410 Gone
411 Content Length Required
412 Precondition Failed
413 Request Entity Too Long
414 Request URI Too Long
415 Unsupported Media Type
Server Errors
500 Internal Server Error
501 Not Implemented
502 Bad Gateway
503 Service Unavailable
504 Gateway Timeout
505 HTTP Version Not Supported
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