Generated PDFs over HTTPS with Internet Explorer

Please see my new blog

One of the applications I’ve been working on generates PDF files which the customer can download. I’m using the FPDF and FPDI libraries to import PDFs and create copies with generated contents. This has been really easy to code, and it’s been working flawlessly in both Firefox and Safair. When we started testing under Internet Explorer thing started breaking. The problem was that IE would not let the user download the file. The only feedback we got was error messages like “The file is currently unavailable or cannot be found.  Please try again later.” and “The file could not be stored in cache”. After spending some time debugging I found out that IE has problems with file downloads over HTTPS. Google pointed me to The guy in that post spent six hours figuring it out, and he probably saved me six hours as well. The magic required to satisfy Internet Explorers needs:

header(‘Cache-Control: maxage=3600’);
header(‘Pragma: public’);

Spread the message so others can spare some time!



  1. Markus said,

    October 31, 2007 at 1:08 pm

    Thank you! 🙂

  2. tyler said,

    November 7, 2007 at 9:44 pm

    you’re awesome.

  3. Roshan said,

    November 16, 2007 at 8:10 am

    Thank You 🙂

  4. eirikhoem said,

    November 16, 2007 at 8:16 am

    I’m just glad to spread the word 🙂

  5. Jerronimo said,

    December 4, 2007 at 6:02 pm

    I love you man! You’re my god!

  6. Patrick said,

    December 31, 2007 at 10:34 pm

    Awesome! I love M$ products! They’re so…. in need of repair 😉

  7. Brad Cupit said,

    January 19, 2008 at 5:52 pm

    Oh man, you just saved me sooo much time! Thanks for the awesome post!

  8. Oz said,

    February 27, 2008 at 3:12 pm

    Thank you!

  9. Dave Lewicki said,

    March 13, 2008 at 8:10 am

    Worked like a charm. THANKS!!!!!

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