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From "Tom Drake" <...@pobox.com>
Subject Re: mutipart/x-mixed-replace and HttpURLConnection
Date Thu, 29 Nov 2001 19:11:48 GMT
Steve:

An HTTP response may only have one content type. If you wish to send
multiple documents of different types to the client in a single HTTP
response. One way to do this is to set the content type to multipart/mixed,
and encode your messages as follows:

Content-type: multipart/mixed; boundary=END-OF-SECTION

--END-OF-SECTION
Content-type: text/html

<html><head>
<title>Downloading to Disk</title>
</head>
<body>
<h1>Downloading to Disk</h1>
The files "foobar.test" and "foobar2.test" are being downloaded to
your system.  Please read the license agreement carefully.

--END-OF-SECTION
Content-type: application/octet-stream
Content-disposition: filename="foobar.test"

...The contents of "foobar.test" goes here...
--END-OF-SECTION
Content-type: application/octet-stream
Content-disposition: filename="foobar2.test"

...The contents of "foobar2.test" goes here...
--END-OF-SECTION--


Your application will will need to deal with break apart the individual mime
documents.
There are some classes that will help you with this in javax.mail.* and
javax.mail.internet.*;
I think you'll find this in the Java mail api (which you can download from
sun).

I hope this helps.

Tom Drake

----- Original Message -----
From: "Ball, Steve" <Steve_Ball@stercomm.com>
To: <advanced-servlets@yahoogroups.com>
Cc: <advanced-servlets-tutorial@yahoogroups.com>;
<servlet-interest@java.sun.com>; <tomcat-user@jakarta.apache.org>
Sent: Thursday, November 29, 2001 6:45 AM
Subject: mutipart/x-mixed-replace and HttpURLConnection


| I am working on "Server Push" from a Servlet to a Java client using
| HttpURLConnection.  I am attempting to set the boundaries and set the
other
| mime types in my servlet, but my client seems to only understand the first
| call using .setContentType("");  Is what I am doing even feasible?  Any
tips
| would be much appreciated.
|
| ++++++++++++++++++++
| client
| ++++++++++++++++++++
|         URLConnection con = url.openConnection();
|         con.setDoOutput(true);
|         con.setDoInput(true);
|         con.setUseCaches(false);
|         ((HttpURLConnection)con).setRequestMethod("POST");
|         ((HttpURLConnection)con).setRequestProperty("Connection",
| "Keep-Alive");
|         ((HttpURLConnection)con).setRequestProperty("Content-type",
| "multipart/x-mixed-replace; boundary=End");
|
| .
| .
| .
| .
|
| String header = con.getContentType();
| System.out.println("Header:" + header);
| if (header.equals("text/start"))
|            {
|              start = con.getContent();
|               System.out.println("Actual Content:" + (String)start);
|            }
| else if (header.equals("text/file"))
|            {
|               file = con.getContent();
|                System.out.println((String)file);
|            }
| else if (header.equals("text/file-progress"))
|            {
|               fileprogress = con.getContent();
|             System.out.println((String)fileprogress);
|            }
| else if (header.equals("text/end"))
|            {
|              end = con.getContent();
|              System.out.println((String)end);
|              keep_reading = false;
|              }
| else
|             {
|              System.out.println("Unknown Content Type: " + header);
|              Object obj = con.getContent();
|              if (obj != null)
|                   System.out.println("Something is there");
|             else
|                    System.out.println("Nothing is in there");
|
|
| ++++++++++++++++++++
| server
| ++++++++++++++++++++
|
|
| ServletOutputStream out = res.getOutputStream();
| res.setContentType("multipart/x-mixed-replace; boundary=End");
| out.println();
| out.println("--End");
|
| out.println("Content-Type: " + "text/start");
| out.println();
| StringBuffer startCommand = new StringBuffer();
| startCommand.append("Start Data");
|
| //res.setContentType("text/start");
| res.setContentLength(startCommand.toString().getBytes().length + 55);
| out.print(startCommand.toString());
| out.println();
| out.println("--End");
| out.flush();
|
|
|
| Basically, the current behavior of the client is that it is looping around
| and gets from the server only the mime type set using setContentType();
| which in this case is only multipart/x-mixed-replace type.  The content
| types set using the out.println("Content-Type: " + "text/start"); are
| ignored.  By the way, I am supporting my own mime types and that appears
to
| work okay.  The content type which does seem to appear rather than
| x-mixed-replace is a class called sun.net.www.MeteredStream.  As I said
| earlier, any help would be much appreciated.
|
| Thanks,
| Steve
|
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