环境macos 14.6.1、openai 1.44.1，langchain 0.2.16，langchain-openai 0.1.22，proxyman代理本地端口9090，设置langchain_openai代理proxyman抓包，正常写法，传参http_client配置verify=False、proxies允许本地证书抓包。

import os
os.environ["OPENAI_API_KEY"]="sk-xxxx"
os.environ["OPENAI_API_BASE"]="https://api.gptapi.us/v1"

from pprint import pprint
from langchain_core.messages import AIMessage, HumanMessage

messages = [AIMessage(content=f"So you said you were researching ocean mammals?", name="Model")]
messages.append(HumanMessage(content=f"Yes, that's right.",name="Lance"))
messages.append(AIMessage(content=f"Great, what would you like to learn about.", name="Model"))
messages.append(HumanMessage(content=f"I want to learn about the best place to see Orcas in the US.", name="Lance"))

for m in messages:
    m.pretty_print()
# Create a custom httpx client with SSL verification disabled
from httpx import Client
proxies = {
    "http://": "http://192.168.8.110:9090",
    "https://": "http://192.168.8.110:9090"
}
custom_client = Client(verify=False, proxies=proxies)
from langchain_openai import ChatOpenAI
llm = ChatOpenAI(model="gpt-4o", http_client=custom_client)

result = llm.invoke(messages)
print("Result:", result, type(result))

# openai包同理
from openai import OpenAI
client = OpenAI(
    # This is the default and can be omitted
    api_key=os.environ.get("OPENAI_API_KEY"),
    base_url=os.environ.get("OPENAI_API_BASE"),
    http_client=http_client,
)
chat_completion = client.chat.completions.create(
    messages=[
        {
            "role": "user",
            "content": "Say this is a test",
        }
    ],
    model="gpt-3.5-turbo",
)
print(chat_completion.choices[0].message.content)

野路子，直接改langchain_openai代码，通过环境变量OPENAI_PROXY有值时，设置verify=False允许所有openai请求抓包，下次只需要设置OPENAI_PROXY环境变量就可以了

# /Users/xxx/miniforge3/envs/lc-academy-env/lib/python3.11/site-packages/langchain_openai/chat_models/base.py (505-517)
if not self.client:
    if self.openai_proxy and not self.http_client:
        try:
            import httpx
        except ImportError as e:
            raise ImportError(
                "Could not import httpx python package. "
                "Please install it with `pip install httpx`."
            ) from e
-        self.http_client = httpx.Client(proxy=self.openai_proxy)
+        self.http_client = httpx.Client(proxy=self.openai_proxy, verify=False)
    sync_specific = {"http_client": self.http_client}
    self.root_client = openai.OpenAI(**client_params, **sync_specific)  # type: ignore[arg-type]
    self.client = self.root_client.chat.completions

调用示例

import os
os.environ["OPENAI_API_KEY"]="sk-xxxx"
os.environ["OPENAI_API_BASE"]="https://api.gptapi.us/v1"
os.environ["OPENAI_PROXY"]="http://192.168.8.110:9090"

from pprint import pprint
from langchain_core.messages import AIMessage, HumanMessage

messages = [AIMessage(content=f"So you said you were researching ocean mammals?", name="Model")]
messages.append(HumanMessage(content=f"Yes, that's right.",name="Lance"))
messages.append(AIMessage(content=f"Great, what would you like to learn about.", name="Model"))
messages.append(HumanMessage(content=f"I want to learn about the best place to see Orcas in the US.", name="Lance"))

for m in messages:
    m.pretty_print()
# Create a custom httpx client with SSL verification disabled
from langchain_openai import ChatOpenAI
llm = ChatOpenAI(model="gpt-4o")
result = llm.invoke(messages)
print("Result:", result, type(result))