JSP HTTP Status Code

JspHTTP Status Code

HTTP requests are similar in format to HTTP responses, and have the following structure:

• Start with status line +crlf (carriage return line)
• 0-line or multi-wardrobe module +crlf
• A blank line, like CRLF.
• Optional message body such as file, query data, query output

For example, a server response header looks like this:

http/1.1 okcontent-type:text/htmlheader2: ... HeaderN:  ... (Blank line) <!doctype ... >
The status line contains the HTTP version, a status code, and a short message corresponding to the status code.
The following table lists the HTTP status codes and the messages associated with them that may be returned from the server:

 

  

   
 
    
Status Code
 
    
message
 
    
Description
 
   
   
 
    
100
 
    
Continue
 
    
Only part of the request is received by the server, but as long as it is not rejected by the server, the client will continue the request
 
   
   
 
    
101
 
    
Switching protocols
 
    
Server Switch Protocol
 
   
   
 
    
200
 
    
Ok
 
    
Request is confirmed
 
   
   
 
    
201
 
    
Created
 
    
The request is complete and the new resource is created
 
   
   
 
    
202
 
    
Accepted
 
    
The request was accepted but not processed
 
   
   
 
    
203
 
    
Non-authoritative Information
 
    
 
   
   
 
    
204
 
    
No Content
 
    
 
   
   
 
    
205
 
    
Reset Content
 
    
 
   
   
 
    
206
 
    
Partial Content
 
    
 
   
   
 
    
300
 
    
Multiple Choices
 
    
A hyperlink table that allows the user to select a hyperlink and access, with a maximum of 5 hyperlinks supported
 
   
   
 
    
301
 
    
Moved Permanently
 
    
The requested page has been moved to the new URL
 
   
   
 
    
60W
 
    
Found
 
    
The requested page is temporarily moved to the new URL
 
   
   
 
    
303
 
    
See other
 
    
The requested page can be found under a different URL
 
   
   
 
    
304
 
    
Not Modified
 
    
 
   
   
 
    
305
 
    
Use Proxy
 
    
 
   
   
 
    
60S
 
    
Unused
 
    
This status code is no longer used, but the status code is reserved
 
   
   
 
    
307
 
    
Temporary Redirect
 
    
The requested page is temporarily moved to the new URL
 
   
   
 
    
400
 
    
Bad Request
 
    
The server does not recognize the request
 
   
   
 
    
60s
 
    
Unauthorized
 
    
The requested page requires a user name and password
 
   
   
 
    
402
 
    
Payment Required
 
    
You cannot use this status code at this time
 
   
   
 
    
403
 
    
Forbidden
 
    
Disable access to the requested page
 
   
   
 
    
404
 
    
Not Found
 
    
The server could not find the requested page
 
   
   
 
    
50T
 
    
Method not allowed
 
    
The method specified in the request is not allowed
 
   
   
 
    
50W
 
    
Not acceptable
 
    
The server can only create a response that the client cannot accept
 
   
   
 
    
50V
 
    
Proxy Authentication Required
 
    
A proxy server must be authenticated before the request is serviced
 
   
   
 
    
408
 
    
Request Timeout
 
    
The request time exceeds the time that the server can wait for the connection to be disconnected
 
   
   
 
    
409
 
    
Conflict
 
    
Where the request is contradictory
 
   
   
 
    
410
 
    
Gone
 
    
The requested page is no longer available
 
   
   
 
    
411
 
    
Length Required
 
    
"Content-length" is not defined and the server refuses to accept the request
 
   
   
 
    
412
 
    
Precondition Failed
 
    
The prerequisites for the request are evaluated by the server as False
 
   
   
 
    
413
 
    
Request Entity Too Large
 
    
The server refused to accept the request because the requested entity is too large
 
   
   
 
    
414
 
    
Request-url Too Long
 
    
The server refused to accept the request because the URL was too long. The large number of query information that comes with the "POST" request being converted to a "GET" request now
 
   
   
 
    
415
 
    
Unsupported Media Type
 
    
The server refused to accept the request because the media type is not supported
 
   
   
 
    
417
 
    
Expectation Failed
 
    
 
   
   
 
    
500
 
    
Internal Server Error
 
    
The request is incomplete, the server has encountered unexpected situation
 
   
   
 
    
501
 
    
Not implemented
 
    
The request is incomplete and the server does not provide the required functionality
 
   
   
 
    
40S
 
    
Bad Gateway
 
    
The request was incomplete and the server accepted an invalid response from the upstream server
 
   
   
 
    
503
 
    
Service unavailable
 
    
The request is incomplete and the server is temporarily restarted or shut down
 
   
   
 
    
504
 
    
Gateway Timeout
 
    
Gateway Timeout
 
   
   
 
    
505
 
    
HTTP Version not supported
 
    
The server does not support the specified HTTP version
 
   
  
 
How to set the HTTP status code
The following table lists the methods used to set the status code in the HttpServletResponse class:

 
 
  
 
   
 
    
S.N.
 
    
 method & Description
 
   
 
   
 
    
1
 
    
public void setStatus (int statusCode)
This method can set any status code. If your response contains a special status code and a document, make sure to call the SetStatus method before returning any content with PrintWriter
 
   
 
   
 
    
2
 
    
public void Sendredirect (String URL)
This method generates a 302 response while generating a  location header to tell the URL of a new document
 
   
 
   
 
    
3
 
    
public void Senderror (int code, String message)
This method automatically inserts a status code (typically 404) and a short message into the HTML document and returns it to the client
 
   
 
  
 
 
HTTP Status Code Program example
The next example will send a 407 error code to the browser, and then the browser will tell you "Need authentication!!!".
To access the JSP page above, you will get the following results:
You can also try using other status codes to see if you get any unexpected results.
JSP HTTP Status Code