Application Service API (PUT transaction) weird behaviour

[oliverjanik]

https://matrix.org/docs/spec/application_service/unstable.html

Under 2.2.3.1 PUT /transactions/{txnId} it says:

Response:

Status code 200:

The transaction was processed successfully.

Example

{}

It's not very clear that Synapse expects an empty json object back. I just had a 200 with empty response and it kept re-sending transaction 1.

I guess it's either a Synapse bug or the spec should be clearer?

[neilisfragile]

The alternative is to return a 204 No Content - we do it this way (as a convention across the spec) to make it easier to add content in the future without having to change the response code.

[oliverjanik]

It makes sense, I just completely missed that {} is an empty json object and it's mandatory.

[richvdh]

seems like a spec issue