community[patch]: update apify integration to attribute API activity to langchain (#21909)

**Description:** Add `Origin/langchain` to Apify's client's user-agent
to attribute API activity to LangChain (at Apify, we aim to monitor our
integrations to evaluate whether we should invest more in the LangChain
integration regarding functionality and content)

**Issue:** None
**Dependencies:** None
**Twitter handle:** None

docs/docs/integrations/tools/apify.ipynb

@@ -83,7 +83,7 @@
    "source": [
     "loader = apify.call_actor(\n",
     "    actor_id=\"apify/website-content-crawler\",\n",
-    "    run_input={\"startUrls\": [{\"url\": \"https://python.langchain.com/en/latest/\"}]},\n",
+    "    run_input={\"startUrls\": [{\"url\": \"https://python.langchain.com\"}]},\n",
     "    dataset_mapping_function=lambda item: Document(\n",
     "        page_content=item[\"text\"] or \"\", metadata={\"source\": item[\"url\"]}\n",
     "    ),\n",

libs/community/langchain_community/document_loaders/apify_dataset.py

@@ -60,7 +60,11 @@ class ApifyDatasetLoader(BaseLoader, BaseModel):
         try:
             from apify_client import ApifyClient
 
-            values["apify_client"] = ApifyClient()
+            client = ApifyClient()
+            if httpx_client := getattr(client.http_client, "httpx_client"):
+                httpx_client.headers["user-agent"] += "; Origin/langchain"
+
+            values["apify_client"] = client
         except ImportError:
             raise ImportError(
                 "Could not import apify-client Python package. "

libs/community/langchain_community/utilities/apify.py

@@ -31,8 +31,18 @@ class ApifyWrapper(BaseModel):
         try:
             from apify_client import ApifyClient, ApifyClientAsync
 
-            values["apify_client"] = ApifyClient(apify_api_token)
-            values["apify_client_async"] = ApifyClientAsync(apify_api_token)
+            client = ApifyClient(apify_api_token)
+            if httpx_client := getattr(client.http_client, "httpx_client"):
+                httpx_client.headers["user-agent"] += "; Origin/langchain"
+
+            async_client = ApifyClientAsync(apify_api_token)
+            if httpx_async_client := getattr(
+                async_client.http_client, "httpx_async_client"
+            ):
+                httpx_async_client.headers["user-agent"] += "; Origin/langchain"
+
+            values["apify_client"] = client
+            values["apify_client_async"] = async_client
         except ImportError:
             raise ImportError(
                 "Could not import apify-client Python package. "