Getting an error 500 on deep link post

[ashimpi]

I am attempting a deep link creation on Canvas, however, whenever I post a LtiDeepLinkingResponse, Canvas returns back an error 500 (or rather, shows the 500 page in the window). As far as I can tell the payload is properly signed JWT, signed with the same key as in the LTI setup. The decoded JWT is as follows - 

{

12 items

"https://purl.imsglobal.org/spec/lti/claim/message_type":

"LtiDeepLinkingResponse"

"https://purl.imsglobal.org/spec/lti/claim/version":

"1.3.0"

"https://purl.imsglobal.org/spec/lti/claim/deployment_id":

"427:0ef07e583441726e323cbe627dd04ec059de44b6"

"https://purl.imsglobal.org/spec/lti/claim/custom":{}

0 items

"https://purl.imsglobal.org/spec/lti-dl/claim/content_items":[

1 item

0:{

3 items

"title":

"Chapter 1"

"type":

"ltiResourceLink"

"url":

"https://obscured-here/launch/c5095ee9-f8c4-4ad6-aa5a-40a1b7d555b2"

}

]

"iss":

"102720000000000391"

"aud":

"https://canvas.instructure.com"

"sub":

"98c8a219-7c95-44bf-a069-eef2e2113438"

"iat":

1582560438

"nbf":

1582560433

"exp":

1582561038

"nonce":

"557e1245-48ab-4c4b-a01a-fda99ac6ae97"

}

JWT headers are 

{

3 items

"alg":

"RS256"

"kid":

"6be7c27c-4fc7-4597-ba29-66f28f56753f"

"typ":

"JWT"

}

Anyone has any ideas? Any help would be greatly appreciated.

Thanks

[matthew_buckett]

I'm also getting a 500 response when trying a very similar JWT, did you discover what was wrong in your request?

There's also another person who had what looks to be a similar issue: https://community.canvaslms.com/t5/Question-Forum/DeepLinkResponse-Message/m-p/447886

[matthew_buckett]

Ok, in my case I was having the form parameter as "jwt" rather than "JWT", switching to upper case fixed my problems.