HTTP status codes reference
3xx codes (redirection)
List of the HTTP status codes used for the query redirection (3xx codes).
Code | Error | Description |
---|---|---|
300 | Multiple choices | The requested URL corresponds to more than one resource, and the robot failed to determine to which page it refers (code Fix the headers and specify the resource correctly, the robot then will be able to index the page. |
301 | The resource moved permanently | The document isn't used by the server and link redirects to another page (code As the users won't see such documents, it doesn't make sense to show them in the search, so the robot doesn't index them. However, the robot will index the redirect target page, if it's available. |
302 | Resource moved temporarily | The requested resource is temporarily located under another address (code As the users won't see such documents, it doesn't make sense to show them in the search, so the robot doesn't index them. However, the robot will index the redirect target page, if it's available. |
303 | See another resource. | The requested resource resides under a different URL and should be requested with the |
304 | Resource not modified | Code |
305 | Use proxy | The requested resource can be accessed only through the proxy server specified in the |
307 | Temporary redirection | The requested resource has been temporarily relocated to another address. Specify this address in |
Code | Error | Description |
---|---|---|
300 | Multiple choices | The requested URL corresponds to more than one resource, and the robot failed to determine to which page it refers (code Fix the headers and specify the resource correctly, the robot then will be able to index the page. |
301 | The resource moved permanently | The document isn't used by the server and link redirects to another page (code As the users won't see such documents, it doesn't make sense to show them in the search, so the robot doesn't index them. However, the robot will index the redirect target page, if it's available. |
302 | Resource moved temporarily | The requested resource is temporarily located under another address (code As the users won't see such documents, it doesn't make sense to show them in the search, so the robot doesn't index them. However, the robot will index the redirect target page, if it's available. |
303 | See another resource. | The requested resource resides under a different URL and should be requested with the |
304 | Resource not modified | Code |
305 | Use proxy | The requested resource can be accessed only through the proxy server specified in the |
307 | Temporary redirection | The requested resource has been temporarily relocated to another address. Specify this address in |
The 4xx codes (client error)
List of the HTTP status codes used for possible errors in the client's request (4xx codes).
Code | Error | Description |
---|---|---|
400 | Bad request | The request could not be understood by the server due to malformed syntax (code |
401 | Unauthorized request | A password is required to access the document or the user must be registered (code |
402 | Payment for the request is required | Internal error or server configuration error (code |
403 | The access to the resource is forbidden. | The access to the document is forbidden (code |
404 | Resource not found | The document doesn't exist (code |
405 | Invalid method | The method defined in the request (Request-Line) can't be applied for the specified resource, so the robot couldn't index it (code |
406 | Unacceptable request | The required document exists, but the format is incorrect (the language or encoding is not supported by the robot). Code |
407 | Proxy or firewall identification is required. | The proxy server requires registration (code |
408 | Request timed out | The site failed to complete the request within the specified time and the robot disconnected (code |
409 | Conflict | The request conflicts with another request or with the server configuration (code |
410 | Resource unavailable | The requested resource was permanently deleted from the site (code |
411 | Length is required | The server refuses to accept the request without a certain Content-Length header (code |
412 | Precondition processing failed | The server found a mismatch in one or more request header fields (a failure or an error in the precondition processing). Code |
413 | The request body exceeds the allowed size | The server refuses to process the request because it is larger than the server can handle (code |
414 | Request URI is too long | The server refuses to process the request, because the URI (Request-URI) requested by the robot is longer than the server can render (code |
415 | Unsupported MIME type | The server refuses to process the request, because the request body has an unsupported format (code |
416 | The range can't be processed | The server refuses to process the request, because the Range field in the request header contains an invalid byte range (code |
417 | Failed while waiting | The server refuses to process the request, because the value of the |
422 | Unprocessable element | The server can't process one (or more) request element (code |
423 | Blocked | The server refuses to process the request, because one of the required resources is blocked (code |
424 | Incorrect dependency | The server refuses to process the request, because one of the dependent resources is blocked (code |
426 | Upgrade required | The server requested connection upgrade to SSL, but the client doesn't support SSL (code |
Code | Error | Description |
---|---|---|
400 | Bad request | The request could not be understood by the server due to malformed syntax (code |
401 | Unauthorized request | A password is required to access the document or the user must be registered (code |
402 | Payment for the request is required | Internal error or server configuration error (code |
403 | The access to the resource is forbidden. | The access to the document is forbidden (code |
404 | Resource not found | The document doesn't exist (code |
405 | Invalid method | The method defined in the request (Request-Line) can't be applied for the specified resource, so the robot couldn't index it (code |
406 | Unacceptable request | The required document exists, but the format is incorrect (the language or encoding is not supported by the robot). Code |
407 | Proxy or firewall identification is required. | The proxy server requires registration (code |
408 | Request timed out | The site failed to complete the request within the specified time and the robot disconnected (code |
409 | Conflict | The request conflicts with another request or with the server configuration (code |
410 | Resource unavailable | The requested resource was permanently deleted from the site (code |
411 | Length is required | The server refuses to accept the request without a certain Content-Length header (code |
412 | Precondition processing failed | The server found a mismatch in one or more request header fields (a failure or an error in the precondition processing). Code |
413 | The request body exceeds the allowed size | The server refuses to process the request because it is larger than the server can handle (code |
414 | Request URI is too long | The server refuses to process the request, because the URI (Request-URI) requested by the robot is longer than the server can render (code |
415 | Unsupported MIME type | The server refuses to process the request, because the request body has an unsupported format (code |
416 | The range can't be processed | The server refuses to process the request, because the Range field in the request header contains an invalid byte range (code |
417 | Failed while waiting | The server refuses to process the request, because the value of the |
422 | Unprocessable element | The server can't process one (or more) request element (code |
423 | Blocked | The server refuses to process the request, because one of the required resources is blocked (code |
424 | Incorrect dependency | The server refuses to process the request, because one of the dependent resources is blocked (code |
426 | Upgrade required | The server requested connection upgrade to SSL, but the client doesn't support SSL (code |
5xx codes (server error)
List of the HTTP status codes used for possible server errors (5xx codes).
Code | Error | Description |
---|---|---|
500 | Internal server error. | The server encountered an unexpected condition that doesn't allow it to complete the request (code |
501 | Method not supported | The server doesn't support the functionality required to execute the request (code |
502 | Gateway error | The server acting as a gateway or proxy server received an invalid response from an inbound server it accessed while attempting to fulfill the request (code |
503 | Service unavailable | An error occurred due to temporary overload or disconnection for server maintenance (code |
504 | Gateway timeout | The server, while acting as a gateway or proxy, did not receive a timely response from an upstream server it needed to access in order to complete the request (code |
505 | HTTP version isn't supported | The server doesn't support or refuses to support the version of the HTTP protocol used in the robot request message (code |
507 | Insufficient space | The server can't process the request due to the lack of the disk space (code |
510 | Not extended | The server can't process the request because the requested extension is not supported (code |
Code | Error | Description |
---|---|---|
500 | Internal server error. | The server encountered an unexpected condition that doesn't allow it to complete the request (code |
501 | Method not supported | The server doesn't support the functionality required to execute the request (code |
502 | Gateway error | The server acting as a gateway or proxy server received an invalid response from an inbound server it accessed while attempting to fulfill the request (code |
503 | Service unavailable | An error occurred due to temporary overload or disconnection for server maintenance (code |
504 | Gateway timeout | The server, while acting as a gateway or proxy, did not receive a timely response from an upstream server it needed to access in order to complete the request (code |
505 | HTTP version isn't supported | The server doesn't support or refuses to support the version of the HTTP protocol used in the robot request message (code |
507 | Insufficient space | The server can't process the request due to the lack of the disk space (code |
510 | Not extended | The server can't process the request because the requested extension is not supported (code |