Grading for a student's assignment submission returns 400 Bad Request

Please refer to this submission API - Submissions - Canvas LMS REST API Documentation

We observed "400 Bad Request" response status for some student's assignment submissions. Below is the request payload,

{submission[posted_grade]=[52]}

I would like to know reasons for "400 Bad Request" from above mentioned API. I couldn't find any reasons in the API documentation.

Appreciate your valuable feedbacks.

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Robert

A 400 generally means the request was OK but something you sent the API wasn't acceptable.

Not sure what language you're using but most libraries will allow the following:

- Return the full request URL to see if it's properly formatted request string.

- Return the request Response, and see if it details of the error.

You can also try formatting your request in the a browser's JavaScript Console and get the error details.

<SPAN class="keyword token">var</SPAN> submission <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">{</SPAN> posted_grade<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">52</SPAN> <SPAN class="punctuation token">}</SPAN><BR />$<SPAN class="punctuation token">.</SPAN><SPAN class="token function">ajax</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">{</SPAN><BR />     dataType<SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"json"</SPAN><SPAN class="punctuation token">,</SPAN><BR />     url<SPAN class="punctuation token">:</SPAN><SPAN class="string token">'/api/v1/courses/123/assignments/456/submissions/789'</SPAN><SPAN class="punctuation token">,</SPAN><BR />     data<SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">{</SPAN>submission<SPAN class="punctuation token">:</SPAN> submission<SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">,</SPAN><BR /><SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="token function">done</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">function</SPAN><SPAN class="punctuation token">(</SPAN>r<SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN><BR />     console<SPAN class="punctuation token">.</SPAN><SPAN class="token function">log</SPAN><SPAN class="punctuation token">(</SPAN>r<SPAN class="punctuation token">)</SPAN><BR /><SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="token function">error</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">function</SPAN><SPAN class="punctuation token">(</SPAN>r<SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN><BR />     console<SPAN class="punctuation token">.</SPAN><SPAN class="token function">log</SPAN><SPAN class="punctuation token">(</SPAN>r<SPAN class="punctuation token">.</SPAN>responseText<SPAN class="punctuation token">)</SPAN><BR /><SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN>‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

unknown

Hi 26-05-ins-111,

Robert is spot on, if you are happy to share some of the example request with us (sanitised of IDs of course) that would be really helpful so that we might be able to ascertain the cause.

If you have an example of a successful, and a failed request, that would be useful also.

Look forward to hearing from you!

Stuart

unknown

Thanks for considering this.

Here is the example request,

PUT request to {Canvas-Institue-URL}/api/v1/courses/lti_context_id:{context_id}/assignments/{assignment_id}/submissions/lti_user_id:{user_id}

with a request payload - {submission[posted_grade]=[0]}

Since this was hard to figured out, we logged error response and saw that it is - "Student must be enrolled in the course as a student to be graded"

Any idea on how to recreate this issue in CanavsLMS?

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