onHeaders is not always invoked

[mrkam]

I've noticed that onHeaders callback is most often not invoked. in Google Chrome Version 54.0.2840.99 m (64-bit)

[mrkam]

Probably because the source don't send any data upon connection (headers only). Seems like only when a message is sent onHeaders is invoked.

[senthilp]

@yaslama Can you comment on this?

[mrkam]

Looks like the issue is on the browser side. I've tried to use plain XMLHttpRequest and added all possible event listeners. None was invoked after changing the readyState to OPEN although Network tab in Developer Tools does show received response headers for the request.

[mrkam]

Here is how the response looks with curl

-bash-4.1$ curl -iv --raw --header "origin: http://localhost" --header "Accept-Encoding:gzip, deflate, sdch" http://blah-blah-blah/statusUpdates
* About to connect() to blah-blah-blah (#0)
*   Trying blah-blah-blah... connected
* Connected to blah-blah-blah (#0)
> GET /statusUpdates HTTP/1.1
> User-Agent: curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.15.3 zlib/1.2.3 libidn/1.18 libssh2/1.4.2
> Host: blah-blah-blah
> Accept: */*
> origin: http://localhost
> Accept-Encoding:gzip, deflate, sdch
>
< HTTP/1.1 200 OK
HTTP/1.1 200 OK
< Date: Tue, 29 Nov 2016 23:40:27 GMT
Date: Tue, 29 Nov 2016 23:40:27 GMT
< Access-Control-Allow-Origin: http://localhost
Access-Control-Allow-Origin: http://localhost
< Access-Control-Allow-Credentials: true
Access-Control-Allow-Credentials: true
< Access-Control-Expose-Headers: Content-Length,X-Total-Count,Transfer-Encoding
Access-Control-Expose-Headers: Content-Length,X-Total-Count,Transfer-Encoding
< Content-Encoding: identity
Content-Encoding: identity
< Content-Type: application/json
Content-Type: application/json
< Transfer-Encoding: chunked
Transfer-Encoding: chunked

<