How to Make a POST Request to an External API in a flow without postrequest component

[peterjacksonwonka]

Hi.
I'm in need of some guidance on how to execute a POST request to an external API within a LangFlow flow.
Could you provide me with the steps?
Could you advise me on which component would be best to use for making a POST request to an external API within a LangFlow flow?
Thank you for your support
There is no component called 'postrequest.'
There is only 'requestposttool.'
Why can't I see it?
The langflow version is 0.6.7

[dosubot[bot]]

Hey there, @peterjacksonwonka! Great to see you back diving into the depths of LangFlow. Hope you're ready for another adventurous solution hunt! 🚀

Based on your query, it seems you're trying to execute a POST request within a LangFlow flow without using the 'postrequest' component. You also mentioned a component named 'requestposttool', which is not visible in your setup. The reason you're not seeing 'requestposttool' is because the actual class name is PostRequest as per the source code. The naming discrepancy might be causing the confusion.

Since you're not able to use the 'postrequest' component, you can create a custom component to make a POST request. Here's a simplified example of how you can do this:

import requests
from langflow import CustomComponent
from langchain_core.documents import Document

class MyPostRequest(CustomComponent):
    display_name: str = "My POST Request"
    description: str = "Custom component to make a POST request."
    output_types: list[str] = ["Document"]

    def send_post_request(self, url: str, data: str, headers: dict = None) -> Document:
        if headers is None:
            headers = {}
        try:
            response = requests.post(url, headers=headers, data=data)
            try:
                response_json = response.json()
                result = response_json
            except Exception:
                result = response.text
            return Document(
                page_content=str(result),
                metadata={
                    "source": url,
                    "headers": headers,
                    "status_code": response.status_code,
                },
            )
        except Exception as exc:
            return Document(
                page_content=str(exc),
                metadata={
                    "source": url,
                    "headers": headers,
                    "status_code": 500,
                },
            )

    def build(self, document: Document, url: str, headers: dict = None) -> list[Document]:
        data = document.page_content
        result_document = self.send_post_request(url, data, headers)
        return [result_document]

This example defines a custom component MyPostRequest that you can use within LangFlow to make POST requests. It includes a method send_post_request that performs the actual POST request using the requests.post method. The build method is where you would use this component within your flow, passing the necessary URL, data, and headers.

Remember, this is a simplified example. Depending on your specific requirements, you might need to adjust the handling of headers, data, and the response.

I hope this helps! If you have any further questions or need more clarification, feel free to ask.

Sources

• How to Make a POST Request to an External API in a flow
• src/backend/langflow/components/utilities/PostRequest.py

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[Cristhianzl]

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