Support HTTP/2 prior-knowledge, using httpx.Client(http1=False, http2=True). (#1624)

* Pass flag http1 to httpcore.

* Update httpcore version, reorder parameter list

Co-authored-by: ebertli <bert.lindemann@ericsson.com>
Co-authored-by: Tom Christie <tom@tomchristie.com>

Author: bli74

httpx/_client.py

@@ -606,6 +606,7 @@ def __init__(
         cookies: CookieTypes = None,
         verify: VerifyTypes = True,
         cert: CertTypes = None,
+        http1: bool = True,
         http2: bool = False,
         proxies: ProxiesTypes = None,
         mounts: typing.Mapping[str, BaseTransport] = None,
@@ -645,6 +646,7 @@ def __init__(
         self._transport = self._init_transport(
             verify=verify,
             cert=cert,
+            http1=http1,
             http2=http2,
             limits=limits,
             transport=transport,
@@ -658,6 +660,7 @@ def __init__(
                 proxy,
                 verify=verify,
                 cert=cert,
+                http1=http1,
                 http2=http2,
                 limits=limits,
                 trust_env=trust_env,
@@ -675,6 +678,7 @@ def _init_transport(
         self,
         verify: VerifyTypes = True,
         cert: CertTypes = None,
+        http1: bool = True,
         http2: bool = False,
         limits: Limits = DEFAULT_LIMITS,
         transport: BaseTransport = None,
@@ -688,21 +692,28 @@ def _init_transport(
             return WSGITransport(app=app)
 
         return HTTPTransport(
-            verify=verify, cert=cert, http2=http2, limits=limits, trust_env=trust_env
+            verify=verify,
+            cert=cert,
+            http1=http1,
+            http2=http2,
+            limits=limits,
+            trust_env=trust_env,
         )
 
     def _init_proxy_transport(
         self,
         proxy: Proxy,
         verify: VerifyTypes = True,
         cert: CertTypes = None,
+        http1: bool = True,
         http2: bool = False,
         limits: Limits = DEFAULT_LIMITS,
         trust_env: bool = True,
     ) -> BaseTransport:
         return HTTPTransport(
             verify=verify,
             cert=cert,
+            http1=http1,
             http2=http2,
             limits=limits,
             trust_env=trust_env,
@@ -1294,6 +1305,7 @@ def __init__(
         cookies: CookieTypes = None,
         verify: VerifyTypes = True,
         cert: CertTypes = None,
+        http1: bool = True,
         http2: bool = False,
         proxies: ProxiesTypes = None,
         mounts: typing.Mapping[str, AsyncBaseTransport] = None,
@@ -1333,6 +1345,7 @@ def __init__(
         self._transport = self._init_transport(
             verify=verify,
             cert=cert,
+            http1=http1,
             http2=http2,
             limits=limits,
             transport=transport,
@@ -1347,6 +1360,7 @@ def __init__(
                 proxy,
                 verify=verify,
                 cert=cert,
+                http1=http1,
                 http2=http2,
                 limits=limits,
                 trust_env=trust_env,
@@ -1363,6 +1377,7 @@ def _init_transport(
         self,
         verify: VerifyTypes = True,
         cert: CertTypes = None,
+        http1: bool = True,
         http2: bool = False,
         limits: Limits = DEFAULT_LIMITS,
         transport: AsyncBaseTransport = None,
@@ -1376,14 +1391,20 @@ def _init_transport(
             return ASGITransport(app=app)
 
         return AsyncHTTPTransport(
-            verify=verify, cert=cert, http2=http2, limits=limits, trust_env=trust_env
+            verify=verify,
+            cert=cert,
+            http1=http1,
+            http2=http2,
+            limits=limits,
+            trust_env=trust_env,
         )
 
     def _init_proxy_transport(
         self,
         proxy: Proxy,
         verify: VerifyTypes = True,
         cert: CertTypes = None,
+        http1: bool = True,
         http2: bool = False,
         limits: Limits = DEFAULT_LIMITS,
         trust_env: bool = True,

httpx/_transports/default.py

@@ -116,6 +116,7 @@ def __init__(
         self,
         verify: VerifyTypes = True,
         cert: CertTypes = None,
+        http1: bool = True,
         http2: bool = False,
         limits: Limits = DEFAULT_LIMITS,
         trust_env: bool = True,
@@ -133,6 +134,7 @@ def __init__(
                 max_connections=limits.max_connections,
                 max_keepalive_connections=limits.max_keepalive_connections,
                 keepalive_expiry=limits.keepalive_expiry,
+                http1=http1,
                 http2=http2,
                 uds=uds,
                 local_address=local_address,
@@ -211,6 +213,7 @@ def __init__(
         self,
         verify: VerifyTypes = True,
         cert: CertTypes = None,
+        http1: bool = True,
         http2: bool = False,
         limits: Limits = DEFAULT_LIMITS,
         trust_env: bool = True,
@@ -228,6 +231,7 @@ def __init__(
                 max_connections=limits.max_connections,
                 max_keepalive_connections=limits.max_keepalive_connections,
                 keepalive_expiry=limits.keepalive_expiry,
+                http1=http1,
                 http2=http2,
                 uds=uds,
                 local_address=local_address,

setup.py

@@ -59,7 +59,7 @@ def get_packages(package):
         "certifi",
         "sniffio",
         "rfc3986[idna2008]>=1.3,<2",
-        "httpcore>=0.13.0,<0.14.0",
+        "httpcore>=0.13.3,<0.14.0",
         "async_generator; python_version < '3.7'"
     ],
     extras_require={