feat(client/dispatch): try_poll_ready() methods
#3892
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this change is motivated by aiming to use interfaces like `hyper::client::conn::http2::SendRequest::try_send_request()` or `hyper::client::conn::http1::SendRequest::try_send_request()` in the context of tower middleware; the `Service<T>` trait's signature is such that the same error type be returned from `Service::poll_ready()` and `Service::call()`. this means that services that might resolve to a recovered message may call `try_poll_ready` when polling for readiness. this avoids making `TrySendError<T>` constructable externally, see hyperium#3883 as an alternate approach that was considered. Signed-off-by: katelyn martin <[email protected]>
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this change is motivated by aiming to use interfaces like
hyper::client::conn::http2::SendRequest::try_send_request()orhyper::client::conn::http1::SendRequest::try_send_request()in the context of tower middleware; theService<T>trait's signature is such that the same error type be returned fromService::poll_ready()andService::call().this means that services that might resolve to a recovered message may call
try_poll_readywhen polling for readiness.this avoids making
TrySendError<T>constructable externally, see #3883 as an alternate approach that was considered.