When making SEO, we often see code like this in the log:
66.249.70.172 - [31/Dec/2007: 03:36:10 +0800] "GET / 32_10_zh.html HTTP/1.1" 200 18395 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; + http:/ / www.google.com / bot.html) "
There need to know, is that strange number "200" (the other numbers indicate that crawl the file size).
"200" is the HTTP status code .
"200" is the HTTP status code .
SEO process is the most common HTTP status codes are:
- 200 - the server successfully returned the page
- 404 - the requested page does not exist
- 503 - Server Timeout
Other frequently encountered HTTP status code list is as follows:
HTTP Status Code Summary Description
Successful 2 × × successfully processed the request status code.
200 server has successfully processed the request and provide the requested page.
204 server successfully processed the request, but did not return anything.
Redirect 3 × × each request redirection not more than 5 times.
301 requested page has been permanently moved to a new location. When the URLs change, use the 301 code. The search engine index to save the new URL.
302 requested page temporarily moved to a new location. The search engine index to preserve the original URL.
304 If the page has not been updated since the last request the requester, the 304 code tells search engine robots can save bandwidth and overhead.
Client Error 4 × × indicates that the request may be wrong impede the processing server.
400 server does not understand the syntax of the request.
403 server rejected the request.
404 server can not find the requested page. Web page does not exist on the server often returns this code.
After a request to permanently delete the resource 410, the server returns this response. The code 404 (Not Found) code is similar, but in the case of the presence of resources previously not now exist, sometimes used instead of 404 codes. If the resource has been permanently removed, the resources should be used to specify the new location 301.
Server Error 5 × × indicates an internal server error occurred while processing the request.These errors may be errors in the server itself, not with the request.
500 The server encountered an error and could not complete your request.
503 server is currently unavailable (because it is overloaded or down for maintenance).Typically, this is a temporary condition.
200 server has successfully processed the request and provide the requested page.
204 server successfully processed the request, but did not return anything.
Redirect 3 × × each request redirection not more than 5 times.
301 requested page has been permanently moved to a new location. When the URLs change, use the 301 code. The search engine index to save the new URL.
302 requested page temporarily moved to a new location. The search engine index to preserve the original URL.
304 If the page has not been updated since the last request the requester, the 304 code tells search engine robots can save bandwidth and overhead.
Client Error 4 × × indicates that the request may be wrong impede the processing server.
400 server does not understand the syntax of the request.
403 server rejected the request.
404 server can not find the requested page. Web page does not exist on the server often returns this code.
After a request to permanently delete the resource 410, the server returns this response. The code 404 (Not Found) code is similar, but in the case of the presence of resources previously not now exist, sometimes used instead of 404 codes. If the resource has been permanently removed, the resources should be used to specify the new location 301.
Server Error 5 × × indicates an internal server error occurred while processing the request.These errors may be errors in the server itself, not with the request.
500 The server encountered an error and could not complete your request.
503 server is currently unavailable (because it is overloaded or down for maintenance).Typically, this is a temporary condition.
