Sending multiple file uploads as input to Azure function app http trigger

Question

I am trying to send multiple file uploads to a function app (http trigger). The http trigger code is below,

    app = func.FunctionApp(http_auth_level=func.AuthLevel.ADMIN)
    @app.route(route="test_http_trigger", auth_level=func.AuthLevel.ADMIN)
    def test_http_trigger(req: func.HttpRequest) -> func.HttpResponse:
         try:
             if list(req.files.values())[0].filename.split('.')[-1] == 'zip':
                 logging.info(req.files.values())
                 return func.HttpResponse(str(req.files.values()), mimetype="text/html")
             elif list(req.files.values())[0].filename.split('.')[-1] == 'txt':
                 logging.info(req.files.values())
                 return func.HttpResponse(str(req.files.values()),  status_code=200, mimetype="application/json")
             else:
                 return func.HttpResponse('0')
         except Exception as e:
             return func.HttpResponse(f"Internal server error: {e}", status_code=500)

I tried to send multiple files as input using the curl command below,

curl -X POST http://localhost:7071/api/test_http_trigger -F "[email protected]" -F "[email protected]"

This only processes the first file sent. I would like to know the right way to send multiple files to function app.

Thanks,

Are you getting any error?

Ikhtesam Afrin
– Ikhtesam Afrin

2025-01-21 03:31:31 +00:00
Commented Jan 21 at 3:31 — Ikhtesam Afrin
– Ikhtesam Afrin, Commented Jan 21 at 3:31

Ikhtesam Afrin · Accepted Answer · 2025-01-21 05:48:31Z

I have used the below code to process multiple files in Azure function.

import azure.functions as func
import logging

app = func.FunctionApp(http_auth_level=func.AuthLevel.ANONYMOUS)

@app.route(route="http_trigger")
def http_trigger(req: func.HttpRequest) -> func.HttpResponse:
    try:
        files = req.files  
        if not files:
            return func.HttpResponse("No files uploaded", status_code=400)
        
        responses = []
        for file_name, file in files.items():
            file_extension = file.filename.split('.')[-1].lower()
            logging.info(f"Processing file: {file.filename}")
            
            if file_extension == 'zip':
                responses.append(f"Processed ZIP file: {file.filename}")
            elif file_extension == 'txt':
                responses.append(f"Processed TXT file: {file.filename}")
            else:
                responses.append(f"Unsupported file type: {file.filename}")

        return func.HttpResponse("\n".join(responses), mimetype="text/plain", status_code=200)
    except Exception as e:
        logging.error(f"Error processing files: {e}")
        return func.HttpResponse(f"Internal server error: {e}", status_code=500)

I am getting expected response.

Azure Functions Core Tools
Core Tools Version:       4.0.6280 Commit hash: N/A +421f0144b42047aa289ce691dc6db4fc8b6143e6 (64-bit)
Function Runtime Version: 4.834.3.22875

[2025-01-21T05:37:07.821Z] 0.01s - Debugger warning: It seems that frozen modules are being used, which may
[2025-01-21T05:37:07.823Z] 0.00s - make the debugger miss breakpoints. Please pass -Xfrozen_modules=off
[2025-01-21T05:37:07.824Z] 0.00s - to python to disable frozen modules.
[2025-01-21T05:37:07.825Z] 0.00s - Note: Debugging will proceed. Set PYDEVD_DISABLE_FILE_VALIDATION=1 to disable this validation.  
[2025-01-21T05:37:08.046Z] Worker process started and initialized.

Functions:

        http_trigger:  http://localhost:7071/api/http_trigger

For detailed output, run func with --verbose flag.
[2025-01-21T05:37:12.840Z] Host lock lease acquired by instance ID '0000000000000000000000000D2022A4'.
[2025-01-21T05:37:16.692Z] Executing 'Functions.http_trigger' (Reason='This function was programmatically called via the host APIs.', Id=54612ce8-ac41-4db0-9536-12e3d9ff01e4)
[2025-01-21T05:37:22.382Z] Processing file: file1.zip
[2025-01-21T05:37:22.382Z] Processing file: file2.txt
[2025-01-21T05:37:22.472Z] Executed 'Functions.http_trigger' (Succeeded, Id=54612ce8-ac41-4db0-9536-12e3d9ff01e4, Duration=6744ms)

Thanks, I am using the exact script but it still processes only the first file. Did you also use CURL to call the function?
Yes, I have used curl -X POST http://localhost:7071/api/http_trigger -F "file1=@C:\Users\***\Downloads\file1.zip" -F "file2=@C:\Users\***\Downloads\file2.txt" command to trigger the function.

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