Add support for passing binary_location to the SeleniumURLLoader when creating Chrome or Firefox web drivers (#4305)

This commit adds support for passing binary_location to the SeleniumURLLoader when creating Chrome or Firefox web drivers.

This allows users to specify the Browser binary location which is required when deploying to services such as Heroku

This change also includes updated documentation and type hints to reflect the new binary_location parameter and its usage.

fixes #4304

langchain/document_loaders/url_selenium.py

@@ -20,6 +20,7 @@ class SeleniumURLLoader(BaseLoader):
         urls (List[str]): List of URLs to load.
         continue_on_failure (bool): If True, continue loading other URLs on failure.
         browser (str): The browser to use, either 'chrome' or 'firefox'.
+        binary_location (Optional[str]): The location of the browser binary.
         executable_path (Optional[str]): The path to the browser executable.
         headless (bool): If True, the browser will run in headless mode.
         arguments [List[str]]: List of arguments to pass to the browser.
@@ -30,6 +31,7 @@ class SeleniumURLLoader(BaseLoader):
         urls: List[str],
         continue_on_failure: bool = True,
         browser: Literal["chrome", "firefox"] = "chrome",
+        binary_location: Optional[str] = None,
         executable_path: Optional[str] = None,
         headless: bool = True,
         arguments: List[str] = [],
@@ -54,6 +56,7 @@ class SeleniumURLLoader(BaseLoader):
         self.urls = urls
         self.continue_on_failure = continue_on_failure
         self.browser = browser
+        self.binary_location = binary_location
         self.executable_path = executable_path
         self.headless = headless
         self.arguments = arguments
@@ -79,6 +82,8 @@ class SeleniumURLLoader(BaseLoader):
             if self.headless:
                 chrome_options.add_argument("--headless")
                 chrome_options.add_argument("--no-sandbox")
+            if self.binary_location is not None:
+                chrome_options.binary_location = self.binary_location
             if self.executable_path is None:
                 return Chrome(options=chrome_options)
             return Chrome(executable_path=self.executable_path, options=chrome_options)
@@ -93,6 +98,8 @@ class SeleniumURLLoader(BaseLoader):
 
             if self.headless:
                 firefox_options.add_argument("--headless")
+            if self.binary_location is not None:
+                firefox_options.binary_location = self.binary_location
             if self.executable_path is None:
                 return Firefox(options=firefox_options)
             return Firefox(