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The following is referenced from http://wiki.jikexueyuan.com/project/jsp/http-status-codes.html:
The HTTP request format, like the HTTP response message format, has the following structure:
For example, a server response header looks like the following:
http/1.1 okcontent-type:text/htmlheader2: ... HeaderN: ... (Blank line)<!doctype ...><HTML><Head>...</Head><Body>...</Body></HTML>
The status line contains the HTTP version (http/1.1 in the example), the status code (200 in the example), and the short message corresponding to the status codes (OK in the example).
The following is a list of HTTP status codes and related messages that may be returned from the Web server:
| Code: | message: | Description: |
|---|---|---|
| 100 | Continue | Only part of the server request has been received, but as long as it is not denied, the client should continue to request |
| 101 | Switching protocols | The server exchanged the protocol. |
| 200 | Ok | Request is OK |
| 201 | Created | The request is complete and the new resource is created |
| 202 | Accepted | The request was accepted for processing, but the processing was not completed. |
| 203 | Non-authoritative Information | |
| 204 | No Content | |
| 205 | Reset Content | |
| 206 | Partial Content | |
| 300 | Multiple Choices | A list of links. The user can select a link and then jump to that location. A maximum of 5 addresses can be selected |
| 301 | Moved Permanently | The request page has been moved to the new URL |
| 302 | Found | The request page is temporarily moved to the new URL |
| 303 | See other | The request page can be found in a different URL |
| 304 | Not Modified | |
| 305 | Use Proxy | |
| 60S | Unused | This code was used in the previous version. It is no longer in use, but the code remains. |
| 307 | Temporary Redirect | The request page is temporarily moved to the new URL. |
| 400 | Bad Request | The server did not understand the request. |
| 401 | Unauthorized | Request page requires user name and password |
| 402 | Payment Required | You cannot use this code |
| 403 | Forbidden | Do not allow access to the request page |
| 404 | Not Found | The server could not find the request page. |
| 405 | Method not allowed | The method specified in the request is not allowed to be used. |
| 50W | Not acceptable | The server can only generate a response that is not received by the client. |
| 407 | Proxy Authentication Required | A proxy server must be validated before this request gets serviced. |
| 408 | Request Timeout | The request takes longer than the server is ready to wait. |
| 409 | Conflict | The conflict request cannot be implemented. |
| 410 | Gone | The request page is no longer available. |
| 411 | Length Required | "Content-Length" is not defined. The server does not accept the request without it. |
| 412 | Precondition Failed | The server gives the assumption that the given request evaluates to False. |
| 413 | Request Entity Too Large | The server does not accept the request because the request entity is too large. |
| 414 | Request-url Too Long | The server does not accept the request because the URL is too long. This happens when a "POST" request is converted to a "GET" request with very long query information. |
| 415 | Unsupported Media Type | The server does not accept the request because the media type is not supported. |
| 417 | Expectation Failed | |
| 500 | Internal Server Error | The request was not completed. The server encountered an unexpected condition. |
| 501 | Not implemented | The request could not be completed. The server does not support the required functionality. |
| 502 | Bad Gateway | The request could not be completed. Server received an invalid response from the upstream server |
| 503 | Service unavailable | The request could not be completed. The server is temporarily overloaded or paralyzed. |
| 504 | Gateway Timeout | The gateway timed out. |
| 505 | HTTP Version not supported | The server does not support the "HHTP protocol" version. |
To set the HTTP status code method:
The following methods can be used to set the HTTP status code of the servlet program. With the HttpServletResponse object, these methods are available.
| Method | Description |
|---|---|
| public void setStatus (int statusCode) | This method sets an arbitrary status code. The SetStatus method takes an int (status code) as a parameter. If the response contains a special status code and document, be sure to call SetStatus before you actually return anything with PrintWriter. |
| public void Sendredirect (String URL) | The method generates a 302 response and a location header to give the URL of the new document. |
| public void Senderror (int code, String message) | This method sends a status code (usually 404) and a short message that is automatically formatted within the HTML document and sent to the client. |
HTTP Status Code instance:
The following example will send a 407 error code to the client browser, and the browser will display "need to verify!!!" The message.
<HTML><Head><title>Setting HTTP Status Code</title></Head><Body><% // Set ErrorCode andreason. Response.senderror (407, "NEED authentication!!!" );%></Body></HTML>
Now call the above code, the JSP will display the result as follows:
Test Project: Https://github.com/easonjim/5_java_example/tree/master/jspbasics/test6
HTTP status code in JSP
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