Description

When using the /new API endpoint to create a comment for a new thread (i.e., the first comment for a given uri, the title field is required in the request body. However, this requirement is not documented in the API docs. If the title is missing, the API returns a 404 error with the message <p>URI does not exist %s </p> , which is confusing and misleading.

Minimal reproducible steps:

1. Start the isso server
2. Run the following command (without the title field):

curl --location 'http://127.0.0.1:8080/new?uri=test' \
--header 'Content-Type: application/json' \
--data '{
  "text": "hello isso"
}'

3.The response is a 404 with <p>URI does not exist %s</p>

Expected behavior:

• The documentation should clearly state that title is required when creating the first comment for a new thread, or
• The API should return a more helpful error message if title is missing

Actual behavior:

• Returns 404 with an unclear error message

Please consider improving the documentation and/or the API error handling. Thank you!