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

CHANGELOG.md

@@ -50,6 +50,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Bug fixes
 
+* Fixed issue where apps run in Workbench were unexpectedly crashing. Apps in Workbench will now have `ws_per_message_deflate=False` enforced. (#2005)
+
 * Fixed an issue where the `<main>` areas of `ui.page_sidebar()` and `ui.page_navbar()` (with a `sidebar`) were made to be a fillable containers even when `fillable=False`. (#1816)
 
 * Fixed an issue where the `.update_user_input()` method on `ui.Chat()` isn't working in shinylive.  (#1891)

shiny/_main.py

@@ -9,6 +9,7 @@
 import re
 import sys
 import types
+import warnings
 from pathlib import Path
 from typing import Any, Optional
 
@@ -20,6 +21,7 @@
 
 from . import __version__, _autoreload, _hostenv, _static, _utils
 from ._docstring import no_example
+from ._hostenv import is_workbench
 from ._typing_extensions import NotRequired, TypedDict
 from .bookmark._bookmark_state import shiny_bookmarks_folder_name
 from .express import is_express_app
@@ -331,6 +333,9 @@ 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
+
     if reload_dirs is None:
         reload_dirs = []
         if app_dir is not None:
@@ -399,6 +404,17 @@ def run_app(
 
     maybe_setup_rsw_proxying(log_config)
 
+    if is_workbench() and kwargs.get("ws_per_message_deflate"):
+        # Workaround for nginx/uvicorn issue within Workbench
+        # https://github.com/rstudio/rstudio-pro/issues/7368#issuecomment-2918016088
+        warnings.warn(
+            "Overwriting kwarg 'ws_per_message_deflate'=True to False to avoid breaking issue in Workbench",
+            stacklevel=2,
+        )
+        kwargs["ws_per_message_deflate"] = False
+    elif is_workbench():
+        kwargs["ws_per_message_deflate"] = False
+
     uvicorn.run(  # pyright: ignore[reportUnknownMemberType]
         app,
         host=host,