For several endpoints for the logical submission, if you specify the instance ID of a submission edit, Backend will redirect to the corresponding submission version endpoint:
https://github.com/getodk/central-backend/blob/e9dba19f064aed63e58ca54530b90bcc018b72d1/lib/resources/submissions.js#L360-L375
For example, on the QA server, there's a submission edit whose instance ID is uuid:adcaefa3-91d7-4770-a49a-1f5607d0f2f3. The instance ID of the root submission version is uuid:4b2b3e15-5675-4baf-9111-1a548cf312cd. When I request https://test.getodk.cloud/v1/projects/414/forms/children_registration/submissions/uuid:adcaefa3-91d7-4770-a49a-1f5607d0f2f3, the redirect happens as expected. However, if the : in the instance ID is encoded, the redirect doesn't happen: https://test.getodk.cloud/v1/projects/414/forms/children_registration/submissions/uuid%3Aadcaefa3-91d7-4770-a49a-1f5607d0f2f3. Instead, I get an ERR_TOO_MANY_REDIRECTS.
I think the issue is that if the instance ID is encoded in originalUrl, then originalUrl does not contain `/submissions/${params.instanceId}`, because params.instanceId is not encoded. In that case, it doesn't complete the replacement, so it ends up redirecting the user to the same originalUrl.
For several endpoints for the logical submission, if you specify the instance ID of a submission edit, Backend will redirect to the corresponding submission version endpoint:
https://github.com/getodk/central-backend/blob/e9dba19f064aed63e58ca54530b90bcc018b72d1/lib/resources/submissions.js#L360-L375
For example, on the QA server, there's a submission edit whose instance ID is
uuid:adcaefa3-91d7-4770-a49a-1f5607d0f2f3. The instance ID of the root submission version isuuid:4b2b3e15-5675-4baf-9111-1a548cf312cd. When I request https://test.getodk.cloud/v1/projects/414/forms/children_registration/submissions/uuid:adcaefa3-91d7-4770-a49a-1f5607d0f2f3, the redirect happens as expected. However, if the:in the instance ID is encoded, the redirect doesn't happen: https://test.getodk.cloud/v1/projects/414/forms/children_registration/submissions/uuid%3Aadcaefa3-91d7-4770-a49a-1f5607d0f2f3. Instead, I get an ERR_TOO_MANY_REDIRECTS.I think the issue is that if the instance ID is encoded in
originalUrl, thenoriginalUrldoes not contain`/submissions/${params.instanceId}`, becauseparams.instanceIdis not encoded. In that case, it doesn't complete the replacement, so it ends up redirecting the user to the sameoriginalUrl.