* fix: ensure binary events can handle no content-type header
The fix provided in https://github.com/cloudevents/sdk-javascript/pull/118
only included tests for `receiver.check()`, and the change in that
case was to add the `application/json` content type to the cleansed
headers if to type was specified.
However, `receiver.parse()` did not receive the benefit of this change. It
calls `this.check()` but then sanitizes the original headers again, and the
missing content-type was not re-inserted into the newly sanitized headers.
This commit, modifies the code so that `receiver.check()` does not insert
the content-type, but does allow the validation check to pass if no
content-type header exists. When `receiver.parse()` is called, and the
headers are sanitized again - and this time used to look up parser implementation,
the default `application/json` content-is applied if no content-type header
exists.
I've also removed a redundant call to `receiver.check()` in receiver_binary_1.js
and simplified the usage of `Constants` in the test.
Signed-off-by: Lance Ball <lball@redhat.com>
* chore: clean up header sniffing
Signed-off-by: Lance Ball <lball@redhat.com>
72a87dfb2d