feat(volo-http): support http2 and connection pool for client (#574)

This commit adds HTTP/2 support for the HTTP client and connection
pool support for both HTTP/1 and HTTP/2.

As the client interface is relatively simple, this commit introduces a
small number of breaking changes:

Since this PR supports HTTP/2, some configurations that only apply to
HTTP/1 are marked as `deprecated` or removed. Users should configure
via `builder.http1_config()`.

TODO:

1. `rustls` supports setting ALPN for each TLS connection, but
   `tokio-rustls` does not expose this feature, it can only set ALPN
   for the entire configuration (in other words,
   `tokio_rustls::TlsConnector`). We can use `rustls` directly or
   submit an issue to `tokio-rustls` for discussion to fix it.
2. `httpbin` supports HTTP/1 based on pure TCP or TLS, and HTTP/2
   based on TLS, but does not support HTTP/2 based on Cleartext (h2c),
   so there is currently no test case that only supports HTTP/2
   without TLS (although it is a unnecessary feature). We should find
   a site that supports h2c for subsequent testing.

---------

Signed-off-by: Yu Li <[email protected]>

Author: yukiiiteru

Cargo.lock

@@ -30,10 +30,10 @@ echo_command cargo clippy -p volo-grpc --no-default-features --features native-t
 echo_command cargo clippy -p volo-grpc --no-default-features --features native-tls-vendored -- --deny warnings
 echo_command cargo clippy -p volo-grpc --no-default-features --features grpc-web -- --deny warnings
 echo_command cargo clippy -p volo-http --no-default-features -- --deny warnings
-echo_command cargo clippy -p volo-http --no-default-features --features default-client -- --deny warnings
-echo_command cargo clippy -p volo-http --no-default-features --features default-server -- --deny warnings
-echo_command cargo clippy -p volo-http --no-default-features --features client,server,http1 -- --deny warnings
-echo_command cargo clippy -p volo-http --no-default-features --features client,server,http2 -- --deny warnings
+echo_command cargo clippy -p volo-http --no-default-features --features client,http1,json -- --deny warnings
+echo_command cargo clippy -p volo-http --no-default-features --features client,http2,json -- --deny warnings
+echo_command cargo clippy -p volo-http --no-default-features --features server,http1,query,form,json,multipart,ws -- --deny warnings
+echo_command cargo clippy -p volo-http --no-default-features --features server,http2,query,form,json,multipart,ws -- --deny warnings
 echo_command cargo clippy -p volo-http --no-default-features --features full -- --deny warnings
 echo_command cargo clippy -p volo -- --deny warnings
 echo_command cargo clippy -p volo --no-default-features --features rustls-aws-lc-rs -- --deny warnings
@@ -47,7 +47,8 @@ echo_command cargo clippy -p examples --features tls -- --deny warnings
 # Test
 echo_command cargo test -p volo-thrift
 echo_command cargo test -p volo-grpc --features rustls
-echo_command cargo test -p volo-http --features default-client,default-server
+echo_command cargo test -p volo-http --features client,server,http1,query,form,json,tls,cookie,multipart,ws
+echo_command cargo test -p volo-http --features client,server,http2,query,form,json,tls,cookie,multipart,ws
 echo_command cargo test -p volo-http --features full
 echo_command cargo test -p volo --features rustls
 echo_command cargo test -p volo-build

scripts/clippy-and-test.sh

@@ -1,6 +1,6 @@
 [package]
 name = "volo-http"
-version = "0.4.0-rc.1"
+version = "0.4.0-rc.2"
 edition.workspace = true
 homepage.workspace = true
 repository.workspace = true
@@ -96,7 +96,7 @@ tokio-test.workspace = true
 [features]
 default = []
 
-default-client = ["client", "json"]
+default-client = ["client", "http1", "http2", "json"]
 default-server = ["server", "http1", "http2", "query", "form", "json", "multipart"]
 
 full = [
@@ -112,7 +112,6 @@ http2 = ["hyper/http2", "hyper-util/http2"]
 
 client = [
     "hyper/client",
-    "http1", # to be removed
     "dep:async-broadcast", "dep:chrono", "dep:hickory-resolver",
 ] # client core
 server = [