Support streaming with http2 adapter

[faradaytrs]

What version of Hono are you using?

4.7.5

What runtime/platform is your app running on? (with version if possible)

Node 22

What steps can reproduce the bug?

If you use streaming in hono, it sets Transfer-Encoding: chucked.
It works well with http1.1, but fails with h2c because this header is not supported, h2 uses different streaming mechanisms.
So we get an error TypeError [ERR_HTTP2_INVALID_CONNECTION_HEADERS]: HTTP/1 Connection specific headers are forbidden: "transfer-encoding"

What is the expected behavior?

No response

What do you see instead?

No response

Additional information

No response

[faradaytrs]

I am not sure if it's bug or feature request, anyway hono streaming doesn't work with http2

[yusukebe]

Hi @faradaytrs

As you said, this is not a bug, but it's a feature request.

Currently, the hono streaming feature uses Transfer-Encoding: chucked, which is an approach for HTTP/1.1. For some users, this is okay because, for example, Cloudflare Workers will automatically enable streaming on HTTP/2 or H3 on the Cloudflare network, so we don't have to worry about the HTTP protocol.

I never researched this implementation, so I can't say the details. But this will be a future request. Or, future request of Node.js Adapter: https://github.com/honojs/node-server

[ZipBrandon]

I'm also running into this issue, unfortunately.