community[proxy]: Enhancement/add proxy support playwrighturlloader 16751 (#16822)

- **Description:** Enhancement/add proxy support playwrighturlloader
16751
- **Issue:** [Enhancement: Add Proxy Support to PlaywrightURLLoader
Class](https://github.com/langchain-ai/langchain/issues/16751)
  - **Dependencies:** 
  - **Twitter handle:** @ootR77013489

---------

Co-authored-by: root <root@ip-172-31-46-160.ap-southeast-1.compute.internal>
Co-authored-by: Bagatur <baskaryan@gmail.com>

libs/community/langchain_community/document_loaders/url_playwright.py

@@ -2,7 +2,7 @@
 """
 import logging
 from abc import ABC, abstractmethod
-from typing import TYPE_CHECKING, List, Optional
+from typing import TYPE_CHECKING, Dict, List, Optional
 
 from langchain_core.documents import Document
 
@@ -111,6 +111,22 @@ class PlaywrightURLLoader(BaseLoader):
         urls (List[str]): List of URLs to load.
         continue_on_failure (bool): If True, continue loading other URLs on failure.
         headless (bool): If True, the browser will run in headless mode.
+        proxy (Optional[Dict[str, str]]): If set, the browser will access URLs
+            through the specified proxy.
+
+    Example:
+        .. code-block:: python
+
+            from langchain_community.document_loaders import PlaywrightURLLoader
+
+            urls = ["https://api.ipify.org/?format=json",]
+            proxy={
+                "server": "https://xx.xx.xx:15818", # https://<host>:<port>
+                "username": "username",
+                "password": "password"
+            }
+            loader = PlaywrightURLLoader(urls, proxy=proxy)
+            data = loader.load()
     """
 
     def __init__(
@@ -120,6 +136,7 @@ class PlaywrightURLLoader(BaseLoader):
         headless: bool = True,
         remove_selectors: Optional[List[str]] = None,
         evaluator: Optional[PlaywrightEvaluator] = None,
+        proxy: Optional[Dict[str, str]] = None,
     ):
         """Load a list of URLs using Playwright."""
         try:
@@ -133,6 +150,7 @@ class PlaywrightURLLoader(BaseLoader):
         self.urls = urls
         self.continue_on_failure = continue_on_failure
         self.headless = headless
+        self.proxy = proxy
 
         if remove_selectors and evaluator:
             raise ValueError(
@@ -153,7 +171,7 @@ class PlaywrightURLLoader(BaseLoader):
         docs: List[Document] = list()
 
         with sync_playwright() as p:
-            browser = p.chromium.launch(headless=self.headless)
+            browser = p.chromium.launch(headless=self.headless, proxy=self.proxy)
             for url in self.urls:
                 try:
                     page = browser.new_page()
@@ -186,7 +204,7 @@ class PlaywrightURLLoader(BaseLoader):
         docs: List[Document] = list()
 
         async with async_playwright() as p:
-            browser = await p.chromium.launch(headless=self.headless)
+            browser = await p.chromium.launch(headless=self.headless, proxy=self.proxy)
             for url in self.urls:
                 try:
                     page = await browser.new_page()