IEInternals

A look at Internet Explorer from the inside out. @EricLaw left Microsoft in 2012, but was named an IE MVP in '13 & an IE userAgent (http://useragents.ie) in '14
Posts
  • IEInternals

    Challenge-Response Authentication and Zero-Length Posts

    • 5 Comments
    From time-to-time, web developers contact the IE team reporting that they’ve encountered a problem whereby Internet Explorer submits a POST but fails to transmit the content body. This bodyless POST indicates via the Content-Length header that the...
  • IEInternals

    Missing Download Manager Window?

    • 3 Comments
    A few IE9 Beta users have reported that IE will not display the download manager window. When they press CTRL+J or click the View Downloads button on the download notification bar, nothing appears to happen. This is related to corruption of the download...
  • IEInternals

    SOCKS Proxies in Internet Explorer

    • 11 Comments
    We recently had a report over on the IEBlog that SOCKS proxies are not supported by IE9 Beta. That observation is correct, and a regression from prior versions of Internet Explorer; IE9 Beta simply ignores the SOCKS proxy if one is specified in the Internet...
  • IEInternals

    Showing more sites on about:tabs

    • 16 Comments
    By default, IE9 will show 2 rows of your favorite sites on the about:tabs homepage. However, you can customize IE9 to show up to 5 rows with a simple registry modification. Inside the NewTabPage registry key, create a REG_DWORD named NumRows...
  • IEInternals

    Google Image Search and IE9 Beta

    • 8 Comments
    One of the commonly reported bugs on Connect is that Google Image Search shows grey boxes for some of the images in IE9 Beta. I had a quick look at the site this afternoon, and I can easily reproduce the problem , as you can see in the screenshot below...
  • IEInternals

    The Hazards of Relying upon Browser Quirks

    • 8 Comments
    While many web developers find subtle browser behaviors baffling, often browser developers are bewildered by web content. Yesterday, we ran into an interesting site compatibility problem that occurs in the latest internal version of IE9. The site in...
  • IEInternals

    Download Speed in the IE9 Download Manager

    • 90 Comments
    One of the common questions we’ve received about IE9’s new download manager is “Where’s the download speed"?” The answer is that the download speed is shown in a tooltip over the download completion percentage, like so...
  • IEInternals

    How to Uninstall Internet Explorer 9 Beta

    • 29 Comments
    If you want to remove Internet Explorer 9 beta from your computer and go back to your older version of IE, you can do so by simply following these steps.
  • IEInternals

    IE9 Beta Minor Changes List

    • 37 Comments
    In every release of the browser, we make many major feature investments, most of which you can read about in posts over on the IEBlog . However, we also make thousands of small improvements that are often overlooked or not broadly recognized. In this...
  • IEInternals

    Writing Files from Low-Integrity Processes

    • 4 Comments
    Internet Explorer 7 introduced Protected Mode , which uses Windows' Integrity Controls feature to help prevent the contamination of the system with data that originates from the Internet. As a part of this feature, Internet Explorer now maintains two...
  • IEInternals

    Friendly HTTP Error Pages

    • 0 Comments
    Internet Explorer 5 and later will show a “Friendly” HTTP Error page if the server returns certain HTTP Error status codes with a short message body. The intent is to replace a terse server message like this one: ...with a page which...
  • IEInternals

    One Billion...

    • 0 Comments
    SmartScreen has blocked one billion malware downloads . Pretty amazing.
  • IEInternals

    Understanding Conditional Requests and Refresh

    • 14 Comments
    Today's post is a collection of technical tidbits about conditional HTTP requests and the behavior of IE's Refresh button. It's probably of limited interest to most readers, but if you need to deeply understand either of these topics, hopefully you will...
  • IEInternals

    Sad, but true...

    • 2 Comments
  • IEInternals

    IE and the Security Development Lifecycle

    • 0 Comments
    Microsoft's Security Development Lifecycle describes how we engineer security into our products. Earlier this year, Security Program Manager Mark Shlimovich wrote a detailed whitepaper about how SDL was applied to IE8, providing "behind the scenes" insights...
  • IEInternals

    Trivia: Animated GIF Timing

    • 14 Comments
    Every now and again, someone reports that Internet Explorer is "slow" when rendering an animated GIF file. Typically, they'll load a lengthy animation in Firefox and IE and note that it runs much more quickly in Firefox. Similarly, Chrome and Safari are...
  • IEInternals

    Downloads and International Filenames

    • 16 Comments
    A few times a year, I get a question about Internet Explorer's behavior when it comes to downloading files that have non-ASCII characters in the filename, because different browsers have different behavior when handling such files. The server can suggest...
  • IEInternals

    Understanding Cookie Controls

    • 4 Comments
    Internet Explorer offers an extremely rich set of options for controlling cookies . The default settings are fairly well-balanced, but some users may want to introduce more restrictive or specialized controls. To configure cookie settings in IE, click...
  • IEInternals

    Certificate Enrollment from the Browser

    • 2 Comments
    Back in Windows XP, an ActiveX control known as XEnroll could be used from the browser to request digital certificates on the client’s behalf. Certificate authorities and others would use this control when a customer purchased a certificate for...
  • IEInternals

    The Performance Impact of META REFRESH

    • 17 Comments
    Some sites will utilize the META REFRESH directive to perform a client-side redirection. In general, this should be avoided in favor of other redirection types, for instance, a server-side redirection (HTTP/3xx) or by using JavaScript. Using META REFRESH...
  • IEInternals

    XDomainRequest - Restrictions, Limitations and Workarounds

    • 36 Comments
    Update : Internet Explorer 10+ supports CORS using XMLHTTPRequest . You should prefer that object over the legacy XDomainRequest object. In Internet Explorer 8, the XDomainRequest object was introduced. This object allows AJAX applications to make...
  • IEInternals

    Security Intelligence Report Volume 8 Released

    • 0 Comments
    The latest version of Microsoft's Security Intelligence Report has been released, covering July-December 2009. Reading even just the "Key Findings" document paints a fascinating picture of the web threat landscape and improved security of later OS and...
  • IEInternals

    Custom Cursors in CSS

    • 1 Comments
    I spend most of my time on networking, performance, and browser security issues, but while working on a test page recently, I came across some interesting behavior and cross-browser differences when using custom cursors in HTML content. Web developers...
  • IEInternals

    HTTPS Caching and Internet Explorer

    • 18 Comments
    From time-to-time, I get questions about Internet Explorer’s behavior when it comes to caching of HTTPS-delivered content. It comes as a surprise to many that by-default, all versions of Internet Explorer will cache HTTPS content so long as the...
  • IEInternals

    Forcing Internet Explorer To Forget To Not Remember

    • 39 Comments
    All joking aside, last fall, I wrote about the variety of reasons why Internet Explorer might not offer to remember your password on a web form. As I mentioned then, you will not be re-prompted to save your password if you’ve previously declined...
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