The best JSP HTTP status code Tutorial In 2024, In this tutorial you can learn Setting HTTP status code method,HTTP status code Program example,
HTTP request and HTTP response similar format, have the following structure:
For example, a server response header looks like this:
HTTP/1.1 200 OK Content-Type: text/html Header2: /en. /en. HeaderN: /en. (Blank Line) <!doctype /en.> <html> <head>/en.</head> <body> /en. </body> </html>The status line contains the HTTP version, a status code, and a status code corresponding to a short message.
The following table lists the HTTP status codes and messages associated may be returned from the server:
Status Code | news | description |
---|---|---|
100 | Continue | Only part of the request receiving server, but as long as not to be rejected by the server, the client will request the continuation of this |
101 | Switching Protocols | Server switches protocol |
200 | OK | Request is confirmed |
201 | Created | Request complete, a new resource is created |
202 | Accepted | Request is accepted, but not processed |
203 | Non-authoritative Information | |
204 | No Content | |
205 | Reset Content | |
206 | Partial Content | |
300 | Multiple Choices | A hyperlink table, the user can select a hyperlink and visit, maximum support 5 hyperlinks |
301 | Moved Permanently | The requested page has moved to a new URL under |
302 | Found | The requested page temporarily moved to a new URL under |
303 | See Other | The requested page can be found under a different URL |
304 | Not Modified | |
305 | Use Proxy | |
306 | Unused | This status code is no longer in use, but the status code is reserved |
307 | Temporary Redirect | The requested page temporarily moved to a new URL under |
400 | Bad Request | Server does not recognize the request |
401 | Unauthorized | The requested page needs a username and password |
402 | Payment Required | Unfortunately you can not use this status code |
403 | Forbidden | Prohibit access to the requested page |
404 | Not Found | The server could not find the requested page |
405 | Method Not Allowed | The method specified in the request is not allowed |
406 | Not Acceptable | Client server can only create a response unacceptable |
407 | Proxy Authentication Required | Before requesting the service must be certified by a proxy server |
408 | Request Timeout | Request time exceeds the server can wait, the connection is disconnected |
409 | Conflict | There are contradictions request |
410 | Gone | Requested page is no longer available |
411 | Length Required | "Content-Length" is not defined, the server rejects the request |
412 | Precondition Failed | Prerequisites requested by the server evaluate to false |
413 | Request Entity Too Large | Because the request entity is too large, the server rejects the request |
414 | Request-url Too Long | The server refuses to accept the request, because the URL is too long. More information appears in a lot of queries to "POST" request into a "GET" request attached to |
415 | Unsupported Media Type | The server refuses to accept the request, because the media type is not supported |
417 | Expectation Failed | |
500 | Internal Server Error | The request is incomplete, the server met an unexpected condition |
501 | Not Implemented | Request is not complete, the server does not provide the required functionality |
502 | Bad Gateway | The request is incomplete, the server from the upstream server received an invalid response |
503 | Service Unavailable | The request is incomplete, the server is temporarily shut down or reboot |
504 | Gateway Timeout | Gateway Timeout |
505 | HTTP Version Not Supported | Server does not support HTTP version specified |
The following table lists the HttpServletResponse class method used to set the status code:
SN | Method & description |
---|---|
1 | public void setStatus (int statusCode) This method can be set to any status code. If your response contains a status code and a special document, be sure to use PrintWriter return anything before calling the method setStatus |
2 | public void sendRedirect (String url) This method produces a 302 response, while generating a URL Location header tells a new document |
3 | public void sendError (int code, String message) This method will be a status code (usually 404), and a short message automatically inserted HTML document and sends it back to the client |
The following example will send 407 error code to the browser, then the browser will tell you "Need authentication !!!".
<html> <head> <title>Setting HTTP Status Code</title> </head> <body> <% // 设置错误代码,并说明原因 response.sendError(407, "Need authentication!!!" ); %> </body> </html>
Access over JSP pages, you will get the following results:
You can also try using a different status code, you will get to see what unexpected results.