Using Inspectr with FastAPI

FastAPI is a high-performance Python web framework, ideal for building modern APIs. Inspectr lets you debug traffic, inspect payloads, and securely expose your FastAPI endpoints with minimal configuration.

This guide walks you through using Inspectr with a FastAPI project.

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Prerequisites

• Python 3.8+
• FastAPI and Uvicorn installed:

pip install fastapi uvicorn

• Inspectr installed (Install guide →)

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Step 1: Create or Run a FastAPI App

Here’s a simple FastAPI app (main.py):

from fastapi import FastAPI

app = FastAPI()

@app.get("/hello")
def read_root():
    return {"message": "Hello from FastAPI!"}

Start the server:

uvicorn main:app --port 5001

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Step 2: Start Inspectr to Forward Traffic

inspectr --listen=:8080 --backend=http://localhost:5001

Make a request via Inspectr:

curl http://localhost:8080/hello

• The request is forwarded to FastAPI
• The response is captured in Inspectr
• You can view it in the App UI: http://localhost:4004

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Optional: Expose FastAPI Publicly

inspectr \
  --listen=:8080 \
  --backend=http://localhost:5001 \
  --expose \
  --channel=fastapi-demo \
  --channel-code=fastapi123

Your public endpoint:

https://fastapi-demo.in-spectr.dev

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Summary

Inspectr + FastAPI gives you:

• Simple request logging and inspection
• Public webhook endpoint for testing
• Real-time debugging and replay

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