Set client headers on a per request basis.

[0xForerunner]

I need to send out requests with my http json rpc client. Each request will likely have a different set of headers.

Unfortunately I don't think the [rpc(client)] macro exposes any way to create a raw http request that I can add headers to.

My guess here is that the only workaround is to create a new HttpClient with custom headers for each outgoing request, which doesn't seem particularly efficient. Let me know if I'm missing something!

[jsdw]

I wonder if you could use some middleware for this?

One example I can see is https://github.com/paritytech/jsonrpsee/blob/master/examples/examples/http_middleware.rs