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CS320 Web and Internet Programming Generating HTTP Responses

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1 CS320 Web and Internet Programming Generating HTTP Responses
Chengyu Sun California State University, Los Angeles

2 HTTP Response Example HTTP/1.1 200 OK
Content-Type: text/html;charset=ISO Content-Length: 168 Date: Sun, 03 Oct :26:57 GMT Server: Apache-Coyote/1.1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html><head><title>Servlet Life Cycle</title></head> <body> n is 299 and m is 440 </body> </html>

3 HTTP Response Status line Protocol Status code Header [Message body]

4 Common Status Codes 200 (OK) 401 (Unauthorized) 403 (Forbidden)
404 (Not Found) 500 (Internal Server Error)

5 Status Codes 100 – 199: Informational. Client should respond with further action 200 – 299: Request is successful 300 – 399: Files have moved 400 – 499: Error by the client 500 – 599: Error by the server

6 Redirect Codes 301 (Moved Permanently) 302 (Found) 303 (See Other)
GET 302 (Found) a.k.a. (Moved Temporarily) 303 (See Other) GET and POST 307 (Temporary Redirect) GET but not POST

7 Header Fields Request Response Accept Accept-Charset Accept-Encoding
Accept-Language Connection Content-Length Cookies Response Content-Type Content-Encoding Content-Language Connection Content-Length Set-Cookie

8 More Response Header Fields
Location for redirect Refresh “Push” Incremental display Cache-Control, Expires, Pragma for cache policies

9 HttpServletResponse

10 Header Methods in HttpServletResponse
addHeader(), setHeader() addIntHeader(), setIntHeader() addDateHeader(), setDateHeader() containsHeader()

11 More HttpServletResponse Methods
setContentType( String type ) sendRedirect( String location ) 302 Handle relative URL getWriter() For text responses, e.g. HTML pages getOutputStream For binary responses, e.g. images

12 Example: Add Revisited
Redirect the user back to the input form if the parameters are missing or invalid sendRedirect()

13 Example: Countdown Automatically refreshes the display every second
The Refresh header

14 Example: Download Download an image file from the server File I/O
Content type Binary response The Content-Disposition header

15 HTTP Response as Program Output
Understand the HTTP response format Remember the status code ranges and the common status codes Use of headers to generate “special” responses And it’s still Java!

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