[Fixed] How to get around Internet Explorer 11 ignoring my font-face due to cache-control headers?



IE11 does not use my Roboto font-face or my Material Icon font-faces. I’ve narrowed the issue down to the cache-control. When I remove the following from my web.config, IE11 displays my fonts and icons just like any other browser. I found this solution here https://stackoverflow.com/a/37270083/10316412

<add name="Cache-Control" value="no-cache" />
<add name="Pragma" value="no-cache" />

However, I would much prefer not to remove this. Our security scan requires that we have no-cache. We are also not supposed to link to external fonts/icons due to subresource integrity… which is why I have downloaded the fonts and icons into my assets folder.

My Question:

Why does the cache-control affect my fonts not loading? How can I get around this? Can I specify there to be no cache-control headers for just my assets folder?

font-face code for reference:

@font-face {
  font-family: "Roboto";
  src: url(./assets/fonts/Roboto/Roboto-Regular.ttf);

@font-face {
  font-family: "Roboto-Light";
  src: url(./assets/fonts/Roboto/Roboto-Light.ttf);

@font-face {
  font-family: "Roboto-Medium";
  src: url(./assets/fonts/Roboto/Roboto-Medium.ttf);

@font-face {
  font-family: "Roboto-Bold";
  src: url(./assets/fonts/Roboto/Roboto-Bold.ttf);

@font-face {
  font-family: "Roboto-Italic";
  src: url(./assets/fonts/Roboto/Roboto-Italic.ttf);

@font-face {
  font-family: "Material Icons";
  font-style: normal;
  font-weight: 400;
  src: url(assets/google-icons/font/MaterialIcons-Regular.eot); /* For IE6-8 */
  src: local("Material Icons"), local("MaterialIcons-Regular"),
    url(assets/google-icons/font/MaterialIcons-Regular.ttf) format("truetype"),
    url(assets/google-icons/font/MaterialIconsOutlined-Regular.otf) format("opentype"),
    url(assets/google-icons/font/MaterialIconsRound-Regular.otf) format("opentype"),
    url(assets/google-icons/font/MaterialIconsSharp-Regular.otf) format("opentype"),
    url(assets/google-icons/font/MaterialIconsTwoTone-Regular.otf) format("opentype");


As mentioned throughout the post, removing cache-control and pragma headers certainly fixes the issue. However I had certain requirements to keep these headers. While I didn’t directly fix this issue, this is how it was resolved for me –

Our application is deployed to an Azure App Service that utilizes Azure Front Door. I believe front door overwrites some of the headers with its own, so when I deployed it to the environment with front door, the issue disappeared altogether.

I should also mention that I did try the <location> and path suggestions, but those did not work for me.

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