Readme: note about avoid race conditions & memory leaks when closing …

…contexts

README.md

@@ -539,7 +539,7 @@ persistent. See also [`BrowserType.launch_persistent_context`](https://playwrigh
 Note that persistent contexts are launched independently from the main browser
 instance, hence keyword arguments passed in the
 [`PLAYWRIGHT_LAUNCH_OPTIONS`](#playwright_launch_options)
-setting do not apply. 
+setting do not apply.
 
 ### Creating a context during a crawl
 
@@ -592,14 +592,22 @@ def parse(self, response):
 async def parse_in_new_context(self, response):
     page = response.meta["playwright_page"]
     title = await page.title()
+    await page.close()
     await page.context.close()
     return {"title": title}
 
 async def close_context_on_error(self, failure):
     page = failure.request.meta["playwright_page"]
+    await page.close()
     await page.context.close()
 ```
 
+### Avoid race conditions & memory leaks when closing contexts
+Make sure to close the page before closing the context. See
+[this comment](https://github.com/scrapy-plugins/scrapy-playwright/issues/191#issuecomment-1548097114)
+in [#191](https://github.com/scrapy-plugins/scrapy-playwright/issues/191)
+for more information.
+
 ### Maximum concurrent context count
 
 Specify a value for the `PLAYWRIGHT_MAX_CONTEXTS` setting to limit the amount

examples/contexts.py

@@ -99,6 +99,7 @@ async def parse(self, response):
         page = response.meta["playwright_page"]
         context_name = response.meta["playwright_context"]
         storage_state = await page.context.storage_state()
+        await page.close()
         await page.context.close()
         return {
             "url": response.url,

tests/test_browser_contexts.py

@@ -160,8 +160,8 @@ async def test_contexts_startup(self):
 
             page = resp.meta["playwright_page"]
             storage_state = await page.context.storage_state()
-            await page.context.close()
             await page.close()
+            await page.context.close()
             cookie = storage_state["cookies"][0]
             assert cookie["name"] == "foo"
             assert cookie["value"] == "bar"