Here's a simple Python script that creates a tiny HTTP server and echoes back any payload/body sent in a GET request (even though this is very non-standard and most real APIs reject it).

get_body_echo.py

from http.server import BaseHTTPRequestHandler, HTTPServer
import json

class GetBodyEchoHandler(BaseHTTPRequestHandler):
    def do_GET(self):
        # Read the raw body (if any was sent)
        content_length = int(self.headers.get('Content-Length', 0))
        body = self.rfile.read(content_length) if content_length > 0 else b''

        # Prepare response
        self.send_response(200)
        self.send_header('Content-Type', 'application/json')
        self.end_headers()

        # Echo back what we received
        response = {
            "method": self.command,
            "path": self.path,
            "headers": dict(self.headers),
            "body_length": len(body),
            "body": body.decode('utf-8', errors='replace') if body else None
        }

        self.wfile.write(json.dumps(response, indent=2).encode('utf-8'))

    # Optional: also handle HEAD just in case
    def do_HEAD(self):
        self.send_response(200)
        self.send_header('Content-Type', 'application/json')
        self.end_headers()


if __name__ == '__main__':
    HOST = 'localhost'
    PORT = 8000

    server = HTTPServer((HOST, PORT), GetBodyEchoHandler)
    print(f"Server running at http://{HOST}:{PORT}")
    print("Try: curl -X GET -d '{\"hello\":\"world\"}' http://localhost:8000/test")
    print("     or: curl -X GET --data-binary @file.json http://localhost:8000/")
    print("Press Ctrl+C to stop\n")

    try:
        server.serve_forever()
    except KeyboardInterrupt:
        print("\nServer stopped.")
        server.server_close()

python get_body_echo.py

Simple JSON

curl -X GET -H "Content-Type: application/json" \
     -d '{"message": "Hello from GET body", "time": "2026"}' \
     http://localhost:8000/echo

Raw text

curl -X GET --data-binary "secret payload here" \
     http://localhost:8000/test/path

Empty body (normal GET)

curl http://localhost:8000/