HTTP Status/Error Code: Quick Reference

 

During your HTTP sessions, you’ll receive various numbered codes from Web servers.  When connected via HTTP, displays these codes in the log window.  Some codes represent errors.  Most others simply communicate the status of the connection. Here are brief explanations for the most common status and error codes.

 

 

Error or Status Code

Description

100 Series

Informational – These status codes indicate a provisional response. The client should be prepared to receive one or more 1xx responses before receiving a regular response.

100

Continue.

101

Switching protocols.

200 Series

Success – This class of status codes indicates that the server successfully accepted the client request.

200

Okay – The client request has succeeded  This status code indicates that the Web server has successfully processed the request

201

Created.

202

Accepted.

203

Non-authoritative information.

204

No content.

205

Reset content.

206

Partial content.

300 Series

Redirection – The client browser must take more action to fulfill the request. For example, the browser may have to request a different page on the server or repeat the request by using a proxy server.

302

Object moved.

304

Not modified. The client requests a document that is already in its cache and the document has not been modified since it was cached. The client uses the cached copy of the document, instead of downloading it from the server

307

Temporary redirect.

400 Series

Client Error – An error occurs, and the client appears to be at fault. For example, the client may request a page that does not exist, or the client may not provide valid authentication information.

400

Bad request.

401

Access denied.

403

Forbidden.

404

Not found. This error may occur if the file that you are trying to access has been moved or deleted.

404.0

File or directory not found.

404.1

Web site not accessible on the requested port.

405

HTTP verb used to access this page is not allowed (method not allowed).

406

Client browser does not accept the MIME type of the requested page.

407

Proxy authentication required.

412

Precondition failed.

413

Request entity too large.

414

Request-URL too long.

415

Unsupported media type.

416

Requested range not satisfiable.

417

Execution failed.

423

Locked error.

500 Series

Server Error – The server cannot complete the request because it encounters an error.

500

Internal server error.  You see this error message for a wide variety of server-side errors.

500.12

Application is busy restarting on the Web server. Indicates that you tried to load an ASP page while IIS was in the process of restarting the application. This message should disappear when you refresh the page. If you refresh the page and the message appears again, it may be caused by antivirus software that is scanning your Global.asa file.

500.13

Web server is too busy.

500.15

Direct requests for Global.asa are not allowed.

500.16

UNC authorization credentials incorrect. This error code is specific to IIS 6.0.

500.18

URL authorization store cannot be opened. This error code is specific to IIS 6.0.

500.100

Internal ASP error. You receive this error message when you try to load an ASP page that has errors in the code.

501

Header values specify a configuration that is not implemented.

502

Bad Gateway.  Web server received an invalid response while acting as a gateway or proxy. You receive this error message when you try to run a CGI script that does not return a valid set of HTTP headers.

503

Service unavailable. This error code is specific to IIS 6.0.

504

Gateway timeout.

505

HTTP version not supported.

 

 

 

 

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