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fix: incorrect data type when construct_path in chain (#4031)

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A incorrect data type error happened when executing _construct_path in
`chain.py` as follows:

```python
Error with message replace() argument 2 must be str, not int
```

The path is always a string. But the result of `args.pop(param, "")` is
undefined.
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Zeeland 2023-05-04 09:49:47 +08:00 committed by GitHub
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commit c186f18aab
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langchain/chains/api/openapi/chain.py
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@ -61,7 +61,7 @@ class OpenAPIEndpointChain(Chain, BaseModel):
"""Construct the path from the deserialized input."""
path = self.api_operation.base_url + self.api_operation.path
for param in self.param_mapping.path_params:
path = path.replace(f"{{{param}}}", args.pop(param, ""))
path = path.replace(f"{{{param}}}", str(args.pop(param, "")))
return path
def _extract_query_params(self, args: Dict[str, str]) -> Dict[str, str]: