Add proxy support

src/solana/rpc/api.py

@@ -83,7 +83,7 @@ class Client(_ClientCore):  # pylint: disable=too-many-public-methods
         commitment: Default bank state to query. It can be either "finalized", "confirmed" or "processed".
         timeout: HTTP request timeout in seconds.
         extra_headers: Extra headers to pass for HTTP request.
-
+        proxy: Proxy URL to pass to the HTTP client.
     """
 
     def __init__(
@@ -92,10 +92,11 @@ def __init__(
         commitment: Optional[Commitment] = None,
         timeout: float = 10,
         extra_headers: Optional[Dict[str, str]] = None,
+        proxy: Optional[str] = None,
     ):
         """Init API client."""
         super().__init__(commitment)
-        self._provider = http.HTTPProvider(endpoint, timeout=timeout, extra_headers=extra_headers)
+        self._provider = http.HTTPProvider(endpoint, timeout=timeout, extra_headers=extra_headers, proxy=proxy)
 
     def is_connected(self) -> bool:
         """Health check.

src/solana/rpc/async_api.py

@@ -80,6 +80,7 @@ class AsyncClient(_ClientCore):  # pylint: disable=too-many-public-methods
         commitment: Default bank state to query. It can be either "finalized", "confirmed" or "processed".
         timeout: HTTP request timeout in seconds.
         extra_headers: Extra headers to pass for HTTP request.
+        proxy: Proxy URL to pass to the HTTP client.
     """
 
     def __init__(
@@ -88,10 +89,13 @@ def __init__(
         commitment: Optional[Commitment] = None,
         timeout: float = 10,
         extra_headers: Optional[Dict[str, str]] = None,
+        proxy: Optional[str] = None,
     ) -> None:
         """Init API client."""
         super().__init__(commitment)
-        self._provider = async_http.AsyncHTTPProvider(endpoint, timeout=timeout, extra_headers=extra_headers)
+        self._provider = async_http.AsyncHTTPProvider(
+            endpoint, timeout=timeout, extra_headers=extra_headers, proxy=proxy
+        )
 
     async def __aenter__(self) -> "AsyncClient":
         """Use as a context manager."""

src/solana/rpc/providers/async_http.py

@@ -45,10 +45,11 @@ def __init__(
         endpoint: Optional[str] = None,
         extra_headers: Optional[Dict[str, str]] = None,
         timeout: float = DEFAULT_TIMEOUT,
+        proxy: Optional[str] = None,
     ):
         """Init AsyncHTTPProvider."""
         super().__init__(endpoint, extra_headers)
-        self.session = httpx.AsyncClient(timeout=timeout)
+        self.session = httpx.AsyncClient(timeout=timeout, proxy=proxy)
 
     def __str__(self) -> str:
         """String definition for HTTPProvider."""

src/solana/rpc/providers/http.py

@@ -45,10 +45,11 @@ def __init__(
         endpoint: Optional[str] = None,
         extra_headers: Optional[Dict[str, str]] = None,
         timeout: float = DEFAULT_TIMEOUT,
+        proxy: Optional[str] = None,
     ):
         """Init HTTPProvider."""
         super().__init__(endpoint, extra_headers)
-        self.session = httpx.Client(timeout=timeout)
+        self.session = httpx.Client(timeout=timeout, proxy=proxy)
 
     def __str__(self) -> str:
         """String definition for HTTPProvider."""