Saturday, June 6, 2020

HTTP Status Codes

HTTP Status Codes

HTTP status codes are returned by web servers to indicate the status of a request. The status code is a 3-digit code indicating the particular response. The first digit of this code identifies the class of the status code. The remaining 2 digits correspond to the specific condition within the response class. The following table outlines all status codes defined for the HTTP/1.1 

1xx class - Informational
Informational status codes are provisional responses from the web server... they give the client a heads-up on what the server is doing. Informational codes do not indicate an error condition. 
 

100

Continue
The continue status code tells the browser to continue sending a request to the server. 

101

Switching Protocols
The server sends this response when the client asks to switch from HTTP/1.0 to HTTP/1.1 

2xx class - Successful
This class of status code indicates that the client's request was received, understood, and successful. 
 

200

Successful

201

Created

202

Accepted

203

Non-Authorative Information

204

No Content

205

Reset Content

206

Partial Content
The partial content success code is issued when the server fulfills a partial GET request. This happens when the client is downloading a multi-part document or part of a larger file. 

3xx class - Redirection
This code tells the client that the browser should be redirected to another URL in order to complete the request. This is not an error condition. 
 

300

Multiple Choices

301

Moved Permanently

302

Moved Temporarily

303

See Other

304

Not Modified

305

Use Proxy

307

Temporary Redirect

4xx class - Client Error
This status code indicates that the client has sent bad data or a malformed request to the server. Client errors are generally issued by the webserver when a client tries to gain access to a protected area using a bad username and password. 
 

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 Timeout

409

Conflict

410

Gone

411

Length Required

412

Precondition Failed

413

Request Entity Too Long

414

Request-URI Too Long

415

Unsupported Media Type

5xx class - Server Error
This status code indicates that the client's request couldn't be succesfully processed due to some internal error in the web server. These error codes may indicate something is seriously wrong with the web server. 
 

500

Internal Server Error
An internal server error has caused the server to abort your request. This is an error condition that may also indicate a misconfiguration with the web server. However, the most common reason for 500 server errors is when you try to execute a script that has syntax errors. 

501

Not Implemented
This code is generated by a webserver when the client requests a service that is not implemented on the server. Typically, not implemented codes are returned when a client attempts to POST data to a non-CGI (ie, the form action tag refers to a non-executable file). 

502

Bad Gateway
The server, when acting as a proxy, issues this response when it receives a bad response from an upstream or support server. 

503

Service Unavailable
The web server is too busy processing current requests to listen to a new client. This error represents a serious problem with the webserver (normally solved with a reboot). 

504

Gateway Timeout
Gateway timeouts are normally issued by proxy servers when an upstream or support server doesn't respond to a request in a timely fashion. 

505

HTTP Version Not Supported
The server issues this status code when a client tries to talk using an HTTP protocol that the server doesn't support or is configured to ignore.


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