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  1. #1
    royzz is offline Member
    Join Date
    Mar 2011
    Rep Power

    Default Reg: HTTP Response Headers

    Hi All!
    I am trying to build a Downloader.

    What I need to do is get the HTTP response, so that I can use the Content-Length field to start the download. I am sitting behind a proxy server

    Java Code:
    public class HTTPResponseHeader {
    	public static void main(String args[])throws Exception
    		System.setProperty("http.proxyHost", "");
    	    System.setProperty("http.proxyPort", "8080");
    	    String url = "";
    	    //STring url = "";
    	    boolean response= exists(url);
    	public static boolean exists(String URLName){
    	    try {
    	      HttpURLConnection con =(HttpURLConnection) new URL(URLName).openConnection();
    	      for (int i=0; ; i++) 
    	            String name = con.getHeaderFieldKey(i);
    	            String value = con.getHeaderField(i);
    	            if (name == null && value == null){
    	            if (name == null){
    	              System.out.println("Server HTTP version, Response code:");
    	              System.out.println(name + "=" + value);
    	      return (con.getResponseCode() == HttpURLConnection.HTTP_OK);
    	    catch (Exception e) {
    	       return false;
    This is the output which I get:
    Server HTTP version, Response code:
    HTTP/1.0 200 OK

    Date=Mon, 21 Mar 2011 12:25:51 GMT
    Server=Apache/2.2.3 (CentOS)
    Last-Modified=Fri, 11 Mar 2011 11:36:39 GMT
    X-Cache=MISS from
    X-Cache-Lookup=MISS from
    Via=1.0 (squid)

    However, if the file size that I want to download crosses 15 MB(the proxy server has a limit of 15 MB), I get a HTTP 403 error.
    Server HTTP version, Response code:
    HTTP/1.0 403 Forbidden

    Date=Mon, 21 Mar 2011 18:18:05 GMT
    X-Squid-Error=ERR_TOO_BIG 0
    X-Cache=MISS from
    X-Cache-Lookup=MISS from
    Via=1.0 (squid)

    Is there any method to get the HTTP response headers without actually initiating the download/opening the URL apart from the way that I am trying above?

    Thanks in advance,

  2. #2
    rkdperil is offline Member
    Join Date
    Mar 2011
    Rep Power

    Smile Not so good solution,but will work if you don't find anything else

    have the script on the server(some site)
    so independent of wat ur proxy is
    you can simply give the url
    it will create the connection in server side, fetch the headers and return it to you.

    will let u know if i cud think of something else.

    PS. Looks like someone is making good use of their thesis :P
    Last edited by rkdperil; 03-30-2011 at 09:47 PM. Reason: heading

  3. #3
    marianelacutsha Guest

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  4. #4
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