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Tuesday, October 13, 2009 10:53 PM

Using Meddler to Simulate Web Traffic

As mentioned back in July , IE8’s new lookahead downloader has a number of bugs which cause it to issue incorrect speculative download requests. The “BASE Bug” caused the speculative downloader to only respect the <BASE> element for the first speculatively
Posted by EricLaw | 3 Comments
Thursday, August 20, 2009 4:00 PM

Internet Explorer Cookie Internals (FAQ)

Over the five years I’ve worked on Internet Explorer, I’ve probably seen more questions from the community about HTTP cookies than on any other topic. Cookies are an integral component of most websites in use today, and hence problems or unexpected behaviors
Posted by EricLaw | 13 Comments
Monday, July 20, 2009 3:52 PM

Internet Explorer's Cache-Control Extensions

Some time ago, I wrote a summary of how Internet Explorer’s cache works . At the time, I left out mention of the two cache-control directives introduced by IE5: pre-check and post-check . These directives enable a “background update” mechanism where a
Posted by EricLaw | 2 Comments
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Wednesday, July 01, 2009 8:05 PM

IE and the Accept Header

RFC 2616 describes the Accept request header as follows: The Accept request-header field can be used to specify certain media types which are acceptable for the response. Accept headers can be used to indicate that the request is specifically limited
Posted by EricLaw | 15 Comments
Tuesday, June 30, 2009 9:35 PM

Internet Explorer and Custom HTTP Headers

Someone recently asked me for a list of custom HTTP request and response headers introduced by the IE team over the years. Here's the list I've come up with so far (including a few that were introduced before I joined the team): Request Headers UA-CPU
Posted by EricLaw | 0 Comments
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Wednesday, June 17, 2009 6:17 PM

HTTP/HTTPS Port-Blocking in WinINET

Internet Explorer (actually, WinINET, the network stack beneath IE) prohibits use of certain ports for HTTP(S) connections. The intent of this blocking is to prevent Cross Service/Protocol Request Forgery attacks. For instance, an attacker could use HTML
Posted by EricLaw | 2 Comments
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