ConversationSummaryMemory documentation unavailable + import module unclear (LangChain 1.x)

[Ayaan9421]

Type of issue

issue / bug

Language

Python

Description

Issue Summary

I am trying to use ConversationSummaryMemory in LangChain, but the documentation link appears to be broken and the import path shown in tutorials does not work with the latest versions.

What I Tried

Using this import results in:

from langchain.memory import ConversationSummaryMemory

Error:

Import "langchain.memory" could not be resolved

I also tried:

from langchain_community.memory import ConversationSummaryMemory

but I couldn't find any official documentation confirming this change.

Broken Documentation Link
When I search Google and follow links (example):

https://api.python.langchain.com/en/latest/langchain/memory/langchain.memory.summary.ConversationSummaryMemory.html

I get this browser error:

ERR_SSL_VERSION_OR_CIPHER_MISMATCH
"This site can’t provide a secure connection"

My Installed Versions

langchain 1.1.0
langchain-anthropic 1.2.0
langchain-classic 1.0.0
langchain-community 0.4.1
langchain-core 1.1.0
langchain-google-genai 3.2.0
langchain-huggingface 1.1.0
langchain-openai 1.1.0
langchain-text-splitters 1.0.0
langgraph 1.0.4
langgraph-checkpoint 3.0.1
langgraph-prebuilt 1.0.5
langgraph-sdk 0.2.10
langsmith 0.4.48

Expected Behavior
Working documentation link
Correct import path clarification for LangChain 1.x
Updated examples since most YouTube tutorials still use old syntax

Environment
OS: Windows
Python: 3.12
Browser: Chrome (latest)

Additional Notes
A maintainer saw my Reddit post and asked me to create this issue.🙂
Link to that post: https://www.reddit.com/r/LangChain/comments/1p7x3qb/cant_find_documentation_for/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button

[gardner]

openssl

$ openssl s_client -connect api.python.langchain.com:443
Connecting to 104.16.254.120
CONNECTED(00000006)
00A2070502000000:error:0A000410:SSL routines:ssl3_read_bytes:ssl/tls alert handshake failure:ssl/record/rec_layer_s3.c:916:SSL alert number 40
---
no peer certificate available
---
No client certificate CA names sent
Negotiated TLS1.3 group: <NULL>
---
SSL handshake has read 7 bytes and written 1555 bytes
Verification: OK
---
New, (NONE), Cipher is (NONE)
Protocol: TLSv1.3
This TLS version forbids renegotiation.
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
Verify return code: 0 (ok)
---
00A2070502000000:error:0A000197:SSL routines:SSL_shutdown:shutdown while in init:ssl/ssl_lib.c:2834:

curl

$ curl -vvv https://api.python.langchain.com/en/latest/core/prompts/langchain_core.prompts.prompt.PromptTemplate.html
* Host api.python.langchain.com:443 was resolved.
* IPv6: (none)
* IPv4: 104.16.254.120, 104.16.253.120
*   Trying 104.16.254.120:443...
* Connected to api.python.langchain.com (104.16.254.120) port 443
* ALPN: curl offers h2,http/1.1
* (304) (OUT), TLS handshake, Client hello (1):
*  CAfile: /etc/ssl/cert.pem
*  CApath: none
* LibreSSL/3.3.6: error:1404B410:SSL routines:ST_CONNECT:sslv3 alert handshake failure
* Closing connection
curl: (35) LibreSSL/3.3.6: error:1404B410:SSL routines:ST_CONNECT:sslv3 alert handshake failure

curl -k

$ curl -vvLk http://api.python.langchain.com/en/latest/core/prompts/langchain_core.prompts.prompt.PromptTemplate.html
* Host api.python.langchain.com:80 was resolved.
* IPv6: (none)
* IPv4: 104.16.254.120, 104.16.253.120
*   Trying 104.16.254.120:80...
* Connected to api.python.langchain.com (104.16.254.120) port 80
> GET /en/latest/core/prompts/langchain_core.prompts.prompt.PromptTemplate.html HTTP/1.1
> Host: api.python.langchain.com
> User-Agent: curl/8.7.1
> Accept: */*
> 
* Request completely sent off
< HTTP/1.1 409 Conflict
< Date: Sun, 30 Nov 2025 04:08:43 GMT
< Content-Type: text/plain; charset=UTF-8
< Content-Length: 16
< Connection: close
< X-Frame-Options: SAMEORIGIN
< Referrer-Policy: same-origin
< Cache-Control: private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0
< Expires: Thu, 01 Jan 1970 00:00:01 GMT
< Server: cloudflare
< CF-RAY: 9a677c36db0bd9b8-AKL
< 
* Closing connection

[mdrxy]

ConversationSummaryMemory has been moved to langchain-classic along with other memory imports; see the migration guide https://docs.langchain.com/oss/python/migrate/langchain-v1#simplified-package

We are working to add memory to the new API reference: https://reference.langchain.com/python/langchain_classic/memory/

[gardner]

Are there any plans to put a 301 Redirect in place for all the indexed search results that point to api.python.langchain.com?

[mdrxy]

Working on redirects!

Here's that page: https://reference.langchain.com/python/langchain_core/prompts/