Prentice Hall and Sun Microsystems. Personal use only; do not redistribute.

6.2 HTTP 1.1 Status Codes and Their Purpose

133

407 (Proxy Authentication Required)

The 407 (

SC_PROXY_AUTHENTICATION_REQUIRED

) value is similar 

to 401, but it is used by proxy servers. It indicates that the client must 

authenticate itself with the proxy server. The proxy server returns a 

Proxy Authenticate

 response header to the client, which results 

in the browser reconnecting with a 

Proxy Authorization

 request 

header. This status code is new in HTTP 1.1. 

408 (Request Timeout)

The 408 (

SC_REQUEST_TIMEOUT

) code means that the client took too 

long to finish sending the request. It is new in HTTP 1.1. 

409 (Conflict)

Usually associated with 

PUT

 requests, the 409 (

SC_CONFLICT

) status is 

used for situations such as an attempt to upload an incorrect version of a 

file. This status code is new in HTTP 1.1. 

410 (Gone)

A value of 410 (

SC_GONE

) tells the client that the requested document 

is gone and no forwarding address is known. Status 410 differs from 

404 in that the document is known to be permanently gone, not just 

unavailable for unknown reasons, as with 404. This status code is new 

in HTTP 1.1. 

411 (Length Required)

A status of 411 (

SC_LENGTH_REQUIRED

) signifies that the server cannot 

process the request (assumedly a 

POST

 request with an attached docu 

ment) unless the client sends a 

Content Length

 header indicating the 

amount of data being sent to the server. This value is new in HTTP 1.1. 

412 (Precondition Failed)

The 412 (

SC_PRECONDITION_FAILED

) status indicates that some pre 

condition specified in the request headers was false. It is new in HTTP 

1.1. 

413 (Request Entity Too Large)

A status code of 413 (

SC_REQUEST_ENTITY_TOO_LARGE

) tells the client 

that the requested document is bigger than the server wants to handle 

Second edition of this book: www.coreservlets.com; Sequel: www.moreservlets.com.

Servlet and JSP training courses by book's author: courses.coreservlets.com.