Access to Request from RequestBuilder

[Ten0]

We have a use-case where, while building a request through a RequestBuilder, we need to access the currently generated url of the request to generate a signature.
e.g.

fn prepare_request() -> Result<RequestBuilder, /* ... */> {
    Ok(client
        .get(url)
        .query(
            &[("lang", lang)]), // or any other serializable structure, possibly a generic type parameter...
        )
        .header("signature", hmac(/*need full URL here*/, secret)))
 }

For that use-case, it would be useful to be able to access the current Request from the RequestBuilder: we could then write this function in the following way:

fn prepare_request() -> Result<RequestBuilder, /* ... */> {
    let request_builder = client
        .get(url)
        .query(
            &[("lang", lang)]), // or any other serializable structure, possibly a generic type parameter...
        );
    Ok(request_builder.header("signature", hmac(request_builder.request()?.url(), secret)))
 }

[huacnlee]

I have a same problem, please make RequestBuilder.request as public.

[ducaale]

@Ten0 what is the reason behind returning RequestBuilder instead of Request? You can always add the signature later by mutating your request object via Request::headers_mut().

[Ten0]

It's part of a request building framework where other operands may be chained behind, so it is required that the return of each operand is a RequestBuilder.