Questions regarding HTTP/2

[Asking Student]

Hello there,

I am currently writing my bachelor thesis about HTTP/2 and am currently looking at implementations.

I have two questions regarding OpenLiteSpeed.

1. Is ist only possible to configure HTTP/2 over TLS? I could not find a setting to enable h2c.
2. Does OpenLiteSpeed fully support HTTP/2 prioritization?

I hope someone can help me.

 

[lsfoo]

Hi,

So you are aware, we are aware of your questions. I'll get you the answers when we have the time to properly answer the questions.

Cheers,
Kevin

 

[Asking Student]

Hi Kevin,

thank you very much. I'm looking forward to it.

 

[lsfoo]

1. OLS supports h2c via an "Upgrade" header.
2. OLS supports stream priority via the bits in the stream header.

Hope these answer your questions!
Kevin

 

[Asking Student]

Thank you very much! I appreciate it.

However I was not able to enable h2c via "Upgrade". I was only able to activate HTTP/2 for TLS connections (h2). Do you know by any chance how to make h2c work?

 

[lskagan]

We ran some tests today that confirmed that h2c does seem to work.

localhost ~$ curl -I 'example.com' -H 'Host: example.com' -H 'User-Agent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:49.0) Gecko/20100101 Firefox/49.0' -H 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8' -H 'Accept-Language: en-US,en;q=0.5' --compressed -H 'Connection: keep-alive' -H 'Upgrade-Insecure-Requests: 1' -H 'Pragma: no-cache' -H 'Cache-Control: no-cache' -H 'Upgrade: h2c'
HTTP/1.1 101 Switching Protocols
Connection: Upgrade
Upgrade: h2c

As per http2 guide found on github

A client that makes a request for an "http" URI without prior knowledge about support for HTTP/2 on the next hop uses the HTTP Upgrade mechanism (Section 6.7 of [RFC7230]). The client does so by making an HTTP/1.1 request that includes an Upgrade header field with the "h2c" token. Such an HTTP/1.1 request MUST include exactly one HTTP2-Settings (Section 3.2.1) header field.

Best Regards,
Jon