Question 1

How do I set up CL-HTTP2-PROTOCOL on macOS or Windows?

Accepted Answer

The README only provides instructions for Ubuntu Linux; setting up on other OSes may require adapting the shell commands and ensuring compatibility with SBCL and dependencies like OpenSSL, which isn't documented.

Question 2

CL-HTTP2-PROTOCOL vs other Lisp HTTP libraries like Hunchentoot?

Accepted Answer

CL-HTTP2-PROTOCOL is a low-level protocol library focused on HTTP/2 draft-14, whereas Hunchentoot is a full-featured HTTP/1.1 web server; for HTTP/2 support, you'd need to integrate this library, but it lacks high-level abstractions.

Question 3

How to implement server push with CL-HTTP2-PROTOCOL?

Accepted Answer

Use the `promise` function on a server stream to send push promises, as shown in the server push example; however, you must manually handle promise streams and response interleaving, which adds complexity.

Question 4

What dependencies does CL-HTTP2-PROTOCOL need?

Accepted Answer

It requires Quicklisp, CL+SSL, CL-ASYNC, CL-ASYNC-SSL, and other libraries like Alexandria, with overrides provided in the source tree; see the setup script in the README for the full list.

Question 5

Is this library compatible with modern browsers using HTTP/2?

Accepted Answer

It may work with browsers from 2014 like Firefox Nightly and Chrome Canary, as noted, but due to the draft-14 basis, interoperability with current HTTP/2 implementations could be unreliable without updates.

Question 6

How to handle TLS certificates for the example server?

Accepted Answer

The README includes OpenSSL commands to regenerate mykey.pem, mycert.pem, and dhparams.2048.pem files, but the example client does no certificate validation, making it unsuitable for production security.

Question 7

Can I use CL-HTTP2-PROTOCOL without CL-ASYNC for event loops?

Accepted Answer

The library is transport-agnostic, but the examples use CL-ASYNC; you can implement your own transport layer by providing socket handling and integrating with the `:frame` event callbacks, as hinted in the getting started section.

cl-http2-protocol

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