Allow construction with HttpConnector and default ClientConfig

.azure-pipelines.yml

@@ -21,7 +21,7 @@ jobs:
     - template: admin/pipelines/cargo-steps.yml
 - job: MacOS
   pool:
-    vmImage: macOS-10.13
+    vmImage: macOS-10.14
   steps:
     - template: admin/pipelines/rustup.yml
     - template: admin/pipelines/cargo-steps.yml

src/connector.rs

@@ -2,6 +2,7 @@ use futures_util::FutureExt;
 #[cfg(feature = "tokio-runtime")]
 use hyper::client::connect::HttpConnector;
 use hyper::{client::connect::Connection, service::Service, Uri};
+use log::warn;
 use rustls::ClientConfig;
 use std::future::Future;
 use std::pin::Pin;
@@ -11,7 +12,6 @@ use std::{fmt, io};
 use tokio::io::{AsyncRead, AsyncWrite};
 use tokio_rustls::TlsConnector;
 use webpki::DNSNameRef;
-use log::warn;
 
 use crate::stream::MaybeHttpsStream;
 
@@ -24,41 +24,52 @@ pub struct HttpsConnector<T> {
     tls_config: Arc<ClientConfig>,
 }
 
-#[cfg(all(any(feature = "rustls-native-certs", feature = "webpki-roots"), feature = "tokio-runtime"))]
+#[cfg(all(
+    any(feature = "rustls-native-certs", feature = "webpki-roots"),
+    feature = "tokio-runtime"
+))]
 impl HttpsConnector<HttpConnector> {
     /// Construct a new `HttpsConnector`.
-    ///
-    /// Takes number of DNS worker threads.
     pub fn new() -> Self {
         let mut http = HttpConnector::new();
+
         http.enforce_http(false);
+
+        (http, Self::default_client_config()).into()
+    }
+
+    /// Constructs default `ClientConfig` which later can be used for
+    /// construction of `HttpsConnector` with custom `HttpConnector`.
+    pub fn default_client_config() -> ClientConfig {
         let mut config = ClientConfig::new();
         config.alpn_protocols = vec![b"h2".to_vec(), b"http/1.1".to_vec()];
-        #[cfg(feature = "rustls-native-certs")] 
+        #[cfg(feature = "rustls-native-certs")]
         {
             config.root_store = match rustls_native_certs::load_native_certs() {
                 Ok(store) => store,
                 Err((Some(store), err)) => {
                     warn!("Could not load all certificates: {:?}", err);
                     store
                 }
-                Err((None, err)) => {
-                    Err(err).expect("cannot access native cert store")
-                }
+                Err((None, err)) => Err(err).expect("cannot access native cert store"),
             };
         }
-        #[cfg(feature = "webpki-roots")] 
+        #[cfg(feature = "webpki-roots")]
         {
             config
                 .root_store
                 .add_server_trust_anchors(&webpki_roots::TLS_SERVER_ROOTS);
         }
         config.ct_logs = Some(&ct_logs::LOGS);
-        (http, config).into()
+
+        config
     }
 }
 
-#[cfg(all(any(feature = "rustls-native-certs", feature = "webpki-roots"), feature = "tokio-runtime"))]
+#[cfg(all(
+    any(feature = "rustls-native-certs", feature = "webpki-roots"),
+    feature = "tokio-runtime"
+))]
 impl Default for HttpsConnector<HttpConnector> {
     fn default() -> Self {
         Self::new()
@@ -73,7 +84,7 @@ impl<T> fmt::Debug for HttpsConnector<T> {
 
 impl<H, C> From<(H, C)> for HttpsConnector<H>
 where
-    C: Into<Arc<ClientConfig>> 
+    C: Into<Arc<ClientConfig>>,
 {
     fn from((http, cfg): (H, C)) -> Self {
         HttpsConnector {