Retrieving image using HTTP GET method?

I want to send a image to a client browser. My servlet's HTML response to the client browser contains the <img src="..."> tag. The client browser uses the HTTP GET method to call my servlet's DoGet method, and I must transfer the desired image to the client browser in this DoGet method at servlet. Now, the problem is that, what should be the source URL in the image(img) tag that is present in my servlet response to client?
For eg: the img tag should be like this
<img src="http://<hostname>:<portname>/<servletname>/...?[var1=value1]">
Now at the ellipsis that you see in the above source URI, I want to write the type of image file (something.jpg) ,so the browser knows what kind of image file it is.
To sum it up...how to get the image using DoGet method and <img src="...">
Regards,
Amit

To give you a better idea on what's happening, read the RFC:
(HTTP/1.0) http://ftp.ics.uci.edu/pub/ietf/http/rfc1945.html
(HTTP/1.1 - compressed data)
http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html
If you for example execute the command by telnetting to port 80 on a server:
GET http://somewhere.com/some.jpg HTTP/1.0<cr>
<cr>You will get this header:
Trying 217.22.64.73...
Connected to xxx.xxx.xxx
Escape character is '^]'.
HTTP/1.1 200 OK
Date: Fri, 01 Aug 2003 12:36:30 GMT
Server: Apache/1.3.27 (Unix) FrontPage/5.0.2.2510
Last-Modified: Tue, 15 Jul 2003 03:11:52 GMT
ETag: "268de8-2fc4-3f1370f8"
Accept-Ranges: bytes
Content-Length: 12228
Connection: close
Content-Type: image/jpegWatch the last part, that's what the setContentType does, normally the content-type defaults to text/html in a webserver.
A webserver usually maintains a list of file extensions by which it will determine the correct MIME type to emit, when a resource is retrieved.
The browser reads the header, and decides what to do with it, in combination with (X)HTML markup.
Greets.

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Retrieving image using HTTP GET method?

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