Canvas throwing "Internal Server Error" while embedding an IFrame content through API

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sanjay joshi

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May 10, 2013, 2:59:14 PM5/10/13

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Dear All,
I am sorry if this is the wrong group for external tools development related question, we are an educational tool and trying to create an external tool to post our videos back into Canvas HTML editor.

LTI authentication works fine but when users clicks on "Embed" Button from our site this url get’s called :

https://canvas.instructure.com/external_content/success/external_tool?&embed_type=iframe&url=http://*******/portal/site/root/widget/56600&width=500&height=500

In the request header we also see the Canvas_session cookie passed:

__utma=114663061.1741291069.1368201835.1368201835.1368201835.1;

__utmb=114663061.141.8.1368209066581;

__utmz=114663061.1368201835.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none);

canvas_session=6HoBfl6x5zoiNRjds0eYDg+dRfmooCv8tcnQewAsSK9lceKk3khzWMnlcWdqqSZKppTCP8OZMKmPF4MjcvttII-etHXZ7x1V94UDjY8VTYoXlrNY6NvpVxMoDylAMTNLDBF40N98ABNasMCV-so3IrXRNbQhuBwDnQTizn0r_aliRYZkcQnxVP9-ODmIu466dYxDeYyDlcFpzGiT4WdtGkt0kPfw_8nMJMMxTIJSwCrqoDBUugHjAXmgQsEUlaisNGT9rp2xPXoR3Z6TdRY_zVMFdk9RfmWZMCFrw9HZAAIjW-fVh-p3aYjlJiMHEXCFSkYtAcle8gfRKrQA39oGIk3UUzPmfc6cgQPhCi3ARFchvPz_27BzPoXmzTGIwai-1uIohytnZkw553GhuVvY0zeWpUgEc71hiy69bgE-UA3ntCML4x0_yk3PeyHQdy_ufI.Og-ie-Heyj9nrh9nogcZJS4XzQs.UY02ag;

__utmc=114663061

But then in popup where our tool was opened we see following error:

Page Error

There was a problem with your last request. You may have tried to perform an action after a long period of inactivity. If that's the case, try going back, reloading the page you were working on, and resubmitting. If not, please let us know what you were doing when the error happened.

Click here to tell us what happened"

It appears as if Canvas was not able to recognize the session, however the user is logged in . The response header show an internal server happened :

Status=Internal Server Error - 500
Cache-Control=no-cache
Content-Encoding=gzip
Content-Type=text/html; charset=utf-8
Date=Fri, 10 May 2013 18:05:27 GMT
P3P=CP="None, see http://www.instructure.com/privacy-policy"
Server=Apache
Set-Cookie=canvas_session=gGug2Nb-n9bZlqk9vX8eBQ+btog0UYl_WA8hvH6fyhPsH3GcqFJuveaUwx5MqcVcLY0Cio7rE3NetOp4sdxpE0bzAKtfURfH1ODX9idv3GjtmhimaOC4qMMjdFj4gfqfJTCyJ2fyMTcbCw6s5ncLbrkjOG2fu3c_6IOOOwpBhPD7JFOZOU21wMxdKm1ib_YSw3rG2HUU01_y_8Q2QNXIRmtCrfdh-lALSZm3s-kzmEGWL0OqBwtgzEWiNtLkZj365VDMDHeFta1KFxTEShNJn6UsYYNFYrNIqx3Fgt8_ROxtSLF0s_DEuv3hs83vIuLPSD4w038NrT81Ntu-GIfAbnU9Y6O6Jy8MMPo9sdupy-WIYlZKT1SgDqccXANOQAXNUSiaYlMtR9KVRJ8-s4EWngrFIkFliZHCHjcRdDhxE73cwc5oMsjrZjr9De3J2TE7eE.6G_7Hbi8PDZFOiQXN_8H1bVtRwM.UY026A; path=/; secure; HttpOnly
Status=0
Vary=Accept-Encoding
X-Request-Context-Id=1e6e0750-9bca-0130-11b1-02e33ab6c202
X-Session-Id=c9c957ecffc286b15882db2ea4c13c2d
Content-Length=30904
Connection=keep-alive