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docs: clarify hub.pull behavior with non-US LangSmith endpoints (#31270)

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**Description**:

This PR updates the documentation to address a potential issue when
using `hub.pull(...)` with non-US LangSmith endpoints (e.g.,
`https://eu.api.smith.langchain.com`).

By default, the `hub.pull` function assumes the non US-based API URL.
When the `LANGSMITH_ENDPOINT` environment variable is set to a non-US
region, this can lead to `LangSmithNotFoundError 404 not found` errors
when pulling public assets from the LangChain Hub.

Issue: #31191

---------

Co-authored-by: Chester Curme <chester.curme@gmail.com>
This commit is contained in:
Himanshu Sharma 2025-05-19 18:06:37 -05:00 committed by GitHub
parent 0c6137ec2b
commit ff12555bdc
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1 changed files with 5 additions and 1 deletions
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6
docs/docs/tutorials/rag.ipynb
View File

@ -234,6 +234,8 @@
"_ = vector_store.add_documents(documents=all_splits)\n",
"\n",
"# Define prompt for question-answering\n",
"# N.B. for non-US LangSmith endpoints, you may need to specify\n",
"# api_url=\"https://api.smith.langchain.com\" in hub.pull.\n",
"prompt = hub.pull(\"rlm/rag-prompt\")\n",
"\n",
"\n",
@ -535,7 +537,7 @@
},
{
"cell_type": "code",
"execution_count": 10,
"execution_count": null,
"id": "46f378c5-858c-488f-8aef-8b59a6280791",
"metadata": {},
"outputs": [
@ -553,6 +555,8 @@
"source": [
"from langchain import hub\n",
"\n",
"# N.B. for non-US LangSmith endpoints, you may need to specify\n",
"# api_url=\"https://api.smith.langchain.com\" in hub.pull.\n",
"prompt = hub.pull(\"rlm/rag-prompt\")\n",
"\n",
"example_messages = prompt.invoke(\n",