fix: Apps running in Workbench will now have ws_per_message_deflate=False enforced

shiny/_main.py

@@ -19,6 +19,7 @@
 import shiny
 
 from . import __version__, _autoreload, _hostenv, _static, _utils
+from ._hostenv import is_workbench
 from ._docstring import no_example
 from ._typing_extensions import NotRequired, TypedDict
 from .bookmark._bookmark_state import shiny_bookmarks_folder_name
@@ -331,6 +332,14 @@ def run_app(
 
     log_config: dict[str, Any] = copy.deepcopy(uvicorn.config.LOGGING_CONFIG)
 
+    # Workaround for nginx/uvicorn issue within Workbench
+    # https://github.com/rstudio/rstudio-pro/issues/7368#issuecomment-2918016088
+    deflate_args: DeflateArgs = {}
+    if is_workbench():
+        deflate_args = {
+            "ws_per_message_deflate": False,
+        }
+
     if reload_dirs is None:
         reload_dirs = []
         if app_dir is not None:
@@ -412,6 +421,7 @@ def run_app(
         # Don't allow shiny to use uvloop!
         # https://github.com/posit-dev/py-shiny/issues/1373
         loop="asyncio",
+        **deflate_args,  # pyright: ignore[reportArgumentType]
         **reload_args,  # pyright: ignore[reportArgumentType]
         **kwargs,
     )
@@ -713,6 +723,10 @@ class ReloadArgs(TypedDict):
     reload_dirs: NotRequired[list[str]]
 
 
+class DeflateArgs(TypedDict):
+    ws_per_message_deflate: NotRequired[bool]
+
+
 # Check that the version of rsconnect supports Shiny Express; can be removed in the
 # future once this version of rsconnect is widely used. The dependency on "packaging"
 # can also be removed then, because it is only used here. (Added 2024-03)