CODEWITHSUNDEEP
pythonazure-functions
Ron Trunk
Ron Trunk

Reputation: 861

Trying to use HttpClient class in Azure

I'm trying to create a simple Azure Function that checks whether a given URL is available (this is just a proof-of-concept). My problem is I can't figure out which library I need to import to get thr client class. The Azure docs are not at all clear, and all examples are C# or .NET

import logging
import azure.functions as func

def main(req: func.HttpRequest) -> func.HttpResponse:
    logging.info('Python HTTP trigger function processed a request.')

    target = req.params.get('target')
    if not target:
        try:
            req_body = req.get_json()
        except ValueError:
            pass
        else:
            target = req_body.get('target')

    if target:
        try:
            MyClient = HttpClient()
            response = MyClient.GetAsync(f"http://{target}")
        except:
                return func.HttpResponse("Error", status_code = 500)
        if response.StatusCode == 200 or response.StatusCode == 302:
            return func.HttpResponse("OK")
        else:
            return func.HttpResponse("Bad", status_code = 503)
    else:
        return func.HttpResponse(
             "No target specified",
             status_code=400
        )

Requirements.txt:

azure-functions==1.2.1
altgraph==0.17
future==0.18.2
pefile==2019.4.18
PyInstaller==3.6
pywin32-ctypes==0.2.0
PyYAML==5.3.1
requests==2.24.0

Upvotes: 1

Views: 439

Answers (1)

Hury Shen
Hury Shen

Reputation: 15734

For this requirement, you can install requests in your python function by running the below command in "Terminal" window of VS code.

pip install requests

And then import it and use it as below (just check the status_code of response):

enter image description here

Update:

According to some test, I reproduced your problem. It seems you didn't install the requests module success on azure, you just install it in your function in local. Please refer to the steps below:

1. I assume you have installed the requests module in local and run the function success in local(if still have problem, please let me know). Then please run the below command in "Terminal" window in VS code to generate the "requirements.txt".

pip freeze > requirements.txt

enter image description here

The "requirements.txt" is used to install modules, when you deploy the function to azure, azure will install the modules according to the content in "requirements.txt". After running the command above to generate the "requirements.txt", you can see it show like this: enter image description here

The reason for your function showed 500 error(with "this page isn't working") is missing "requests" in "requirements.txt".

2. Then run the command in "Terminal" window to deploy the function from local to azure.

func azure functionapp publish <functionAppName> --build remote

The <functionAppName> is the name of the function app(python) you created on azure portal.

3. After that, go to azure portal to test your function, it will work fine.

Upvotes: 1

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