Plugins fail during a call to NPN_PostURL when hosted in Internet Explorer 4.0x (IE4).

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Append post information onto the end of the URL and use NPN_GetURL instead.

For example, instead of this

   NPN_PostURL(instance, "http://url", "", 9, "postdata", FALSE);
				

Use this

   NPN_GetURL(instance, "http://url?postdata", "");
				

There is an upper limit of 2k on a GET URL. For larger amounts of POST data, there is no workaround available at this time.

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Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug has been fixed in Internet Explorer 4.01 Service Pack 1.

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