Why Do EOT Fonts Fail to Load Over HTTPS in IE7, 8, and 9?

@font-face EOT Not Loading Over HTTPS: Uncovering the Cause

In the realm of web development, @font-face holds immense significance for enriching web pages with custom fonts. However, users may encounter a peculiar issue when utilizing EOT fonts over HTTPS in Internet Explorer 7, 8, and 9.

The Problem:

Despite ensuring the server hosts the font with the correct content-type, EOT fonts fail to load over HTTPS, while they function seamlessly over HTTP. This perplexing behavior has left many developers puzzled.

Analysis:

To investigate this issue further, it's crucial to examine the HTTP header Cache-Control. In certain circumstances, setting Cache-Control to no-cache for the font can lead to IE ignoring downloaded fonts over HTTPS.

Resolution:

Resolving this conundrum lies in removing the Cache-Control header or setting it to a different value that allows caching. By doing so, IE will cease disregarding the downloaded font and render it correctly over HTTPS.

Additional Insight:

It's noteworthy that this behavior may be linked to KB 815313, which prohibits caching during the download of active documents over SSL. Understanding this correlation can help developers identify and rectify similar issues in their web applications.

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