Proxy h2

[TingDaoK]

Issue #, if available:

Description of changes:

• add support for using proxy to setup http/2 connection
• right now only supports talking h1 with proxy and create the http/2 connection from the tunneling proxy.
• Turns out google doesn't like :authority with host, I am totally okay with what ever the real world want. :)

TODO:

The AWS_TEST_HTTPS_H2_PROXY_URL now has a proxy host that can talk http/2 with client. Used apache server with mod_proxy_http2. You can simply use that host for the proxy option and update the tls of proxy options to have h2 in the alpn string to create the h2 connection with proxy. However, I don't know what's the expected behavior for client to talk to a h2 proxy host.

curl doesn't seem supporting it.

So, put it as TODO, but still have the host here incase we want to implement it in the future.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[graebm]

some trivial feedback, but looks good overall

[graebm]

maybe it would be less confusing to just store the alpn_string_map by value? instead of the weird allocate_many thing?
struct aws_hash_table alpn_string_map;
instead of
struct aws_hash_table *alpn_string_map;

It's safe to call our aws_XYZ_clean_up() functions on something that you never called init() on, as long as it's zeroed out

[graebm]

not sure why /* allocated with userdata */ comment is on original_http2_options which is a by-value thing

[TingDaoK]

The options has setting array, which need to be allocated from heap. The comment was for that, will clarify it more.

[codecov-commenter]

Codecov Report

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