HTTP Status Code Errors - Librarians Portal

HTTP status codes (the 4xx and 5xx series) appear when there is some kind of error loading a web page. HTTP status codes are standard types of errors. So, you could see them in any browser, like Internet Explorer, Firefox, Chrome. Torch etc.

Common 4xx and 5xx HTTP status codes are listed below with helpful tips to help you get past them and on to the web page you were looking for.

HTTP status codes that begin with 1, 2, and 3 also exist but are not errors and aren't usually seen.

HTTP Status Lines HTTP Status Codes and HTTP Reason in Phrases

Status Code    Reason Phrase

100                  Continue

101                  Switching Protocols

102                  Processing

200                  OK

201                  Created

202                  Accepted

203                  Non-Authoritative Information

204                  No Content

205                  Reset Content

206                  Partial Content

207                  Multi-Status

300                  Multiple Choices

301                  Moved Permanently

302                  Found

303                  See Other

304                  Not Modified

305                  Use Proxy

307                  Temporary Redirect

400                  Bad Request

401                  Unauthorized

402                  Payment Required

403                  Forbidden

404                  Not Found

405                  Method Not Allowed

406                  Not Acceptable

407                  Proxy Authentication Required

408                  Request Time-out

409                  Conflict

410                  Gone

411                  Length Required

412                  Precondition Failed

413                  Request Entity Too Large

414                  Request-URI Too Large

415                  Unsupported Media Type

416                  Request Range Not Satisfies

417                  Expectation Failed

422                  Unprocessed Entity

423                  Locked

424                  Failed Dependency

425                  Un rdered Collection

426                  Upgrade Required

500                  Internal Server Error

501                  Not Implemented

502                  Bad Gateway

503                  Service Unavailable

504                  Gateway Time-out

505                  HTTP Version Not Supported

506                  Variant Also Negotiates

507                  Insufficient Storage

510                  Not Extended

For example:

The 401 Unauthorized HTTP status code means that the page you were trying to access can not to be loaded until you first log on with a valid username and password. If you have just logged on and received the 401 error, it means that the credentials you entered were invalid. Invalid credentials could mean that you do not have an account with the web site, your username was entered incorrectly, or your password was incorrect.