Content type startswith

[devel0]

allow canHandle not to discard request such as

Content-type: application/json; charset=utf-8

without this patch only valid request for AsyncCallbackJsonWebHandler are

Content-type: application/json

[Domochip]

Hi, I've just encountered this issue.
My solution is a bit different.
I replaced :
if ( !request->contentType().equalsIgnoreCase(JSON_MIMETYPE) )
by :
if ( !request->contentType().substring(0, strlen(JSON_MIMETYPE)).equalsIgnoreCase(JSON_MIMETYPE) )

Simpler to read but create a little heap consumption.
What's your mind about it?

[devel0]

@Domochip I agree, your solution is simpler to read, while mine was designed to work with existing string.

Actually I see this PR isn't yet merged so you could make another PR mentioning this one in your message so that when one of the two will accepted the other could discarded.

Thanks for your suggestion.

[RayPS]

Just encountered the same issue, given 500 error with no any clue or error message, spent lot of hours debugging this library until I found this line:

ESPAsyncWebServer/src/AsyncJson.h

Line 208 in 2f78426

if ( !request->contentType().equalsIgnoreCase(JSON_MIMETYPE) )