solve how can I config root_path dynamically? #4968

.changeset/big-wolves-grab.md

@@ -0,0 +1,5 @@
+---
+"gradio": minor
+---
+
+feat:solve how can I config root_path dynamically? #4968

gradio/blocks.py

@@ -758,7 +758,7 @@ def __init__(
 
         self.allowed_paths = []
         self.blocked_paths = []
-        self.root_path = ""
+        self.root_path = os.environ.get("GRADIO_ROOT_PATH", "")
         self.root_urls = set()
 
         if not wasm_utils.IS_WASM and self.analytics_enabled:
@@ -1690,7 +1690,7 @@ def launch(
         file_directories: list[str] | None = None,
         allowed_paths: list[str] | None = None,
         blocked_paths: list[str] | None = None,
-        root_path: str = "",
+        root_path: str | None = None,
         _frontend: bool = True,
         app_kwargs: dict[str, Any] | None = None,
     ) -> tuple[FastAPI, str, str]:
@@ -1725,7 +1725,7 @@ def launch(
             file_directories: This parameter has been renamed to `allowed_paths`. It will be removed in a future version.
             allowed_paths: List of complete filepaths or parent directories that gradio is allowed to serve (in addition to the directory containing the gradio python file). Must be absolute paths. Warning: if you provide directories, any files in these directories or their subdirectories are accessible to all users of your app.
             blocked_paths: List of complete filepaths or parent directories that gradio is not allowed to serve (i.e. users of your app are not allowed to access). Must be absolute paths. Warning: takes precedence over `allowed_paths` and all other directories exposed by Gradio by default.
-            root_path: The root path (or "mount point") of the application, if it's not served from the root ("/") of the domain. Often used when the application is behind a reverse proxy that forwards requests to the application. For example, if the application is served at "https://example.com/myapp", the `root_path` should be set to "/myapp".
+            root_path: The root path (or "mount point") of the application, if it's not served from the root ("/") of the domain. Often used when the application is behind a reverse proxy that forwards requests to the application. For example, if the application is served at "https://example.com/myapp", the `root_path` should be set to "/myapp". Can be set by environment variable GRADIO_ROOT_PATH. Defaults to "".
             app_kwargs: Additional keyword arguments to pass to the underlying FastAPI app as a dictionary of parameter keys and argument values. For example, `{"docs_url": "/docs"}`
         Returns:
             app: FastAPI app object that is running the demo
@@ -1766,7 +1766,10 @@ def reverse(text):
         self.width = width
         self.favicon_path = favicon_path
         self.ssl_verify = ssl_verify
-        self.root_path = root_path
+        if root_path is None:
+            self.root_path = os.environ.get("GRADIO_ROOT_PATH", "")
+        else:
+            self.root_path = root_path
 
         if enable_queue is not None:
             self.enable_queue = enable_queue