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Multipart/mixed in IE

Posted on 1998-05-01
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Last Modified: 2006-11-17
I have the following code sample written in C for a CGI.  I want to download a file (a zipped file for the same of argument in this example) and at the same time show a new page.
#include <stdio.h>
#include <stdlib.h>

void main()
{
      printf("Content-type:multipart/mixed;boundary=--abcdefg\n\n");
      printf("----abcdefg\n");
      printf("Content-type: application/x-compressed\n\n");
      printf("this is the first data\n\n");
      printf("----abcdefg\n");
      printf("Content-type: text/plain\n\n");
      printf("this is the display data\n\n");
      printf("----abcdefg\n");
}

This all works fine when running any Netscape browser than I've tried.  It prompts me to save the file and then displays the new page.

Different story in IE... it shows the following in the browser:
----abcdefg
Content-type: application/x-compressed

this is the first data

----abcdefg
Content-type: text/plain

this is the display data

----abcdefg

It doesn't parse the multipart stream.

1.  Does IE support the multipart/mixed MIME type?
2.  If so, what's wrong with my code?
3.  If not, what other options do I have to accomplish the same thing.  I've thought about displaying the web page first with a META refresh tag set to 0 seconds that points to the file, but this (for security reasons) is not at all a good solution.

Any help would be greatly appreciated.
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Question by:clc050198
7 Comments
 
LVL 8

Expert Comment

by:Kobe_Lenjou
ID: 1842669
printf("Content-type:multipart/mixed;boundary=--abcdefg\n\n");
Shoulnd there be a space after the : ?
like this:
printf("Content-type: multipart/mixed;boundary=--abcdefg\n\n");

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Author Comment

by:clc050198
ID: 1842670
I have one reference that says yes, and one that says no.  Either way it doesn't work.
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LVL 28

Expert Comment

by:sybe
ID: 1842671
Answer to question nr 1:
No, IE does not support the multipart/mixed MIME type


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LVL 3

Expert Comment

by:percyn
ID: 1842672
There seems to be a bug in IE 4.0 with this. It worked fine for me on IE 4.01, when I used a mime-type of bougs/file.
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Author Comment

by:clc050198
ID: 1842673
percyn.... what server were you using to get it to work with IE4.01?  For me it doesn't work under 4.01 or 4.0.  I'm using IIS as a server.
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Expert Comment

by:percyn
ID: 1842674
IIS 4.0
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Accepted Solution

by:
raky earned 100 total points
ID: 1842675
Try to put quotes in your boundary string like this :

Content-Type: multipart/mixed;
      boundary="----=_NextPart_000_003C_01BD6B2E.8EED5CB0"

See you
Laurent
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