Simple Echo

The core functionality of Advanced Echo Server is to mirror incoming HTTP requests. The server echoes the request body for non-GET requests and provides detailed request information for empty GET requests. It automatically adds X-Request-ID and X-Echo-Request-Count headers to track requests.

How It Works

graph TD
  A[Receive Request] --> B{Check Method}
  B -->|GET, No Body| C[Return Request Info]
  B -->|Other Methods| D[Echo Request Body]
  C --> E[Add X-Request-ID, X-Echo-Request-Count]
  D --> E
  E --> F[Respond with Content-Type]

Echoing Request Body

For POST, PUT, PATCH, etc., the server echoes the request body with the same Content-Type (or text/plain if unspecified).

Endpoint: ANY /
Example:

curl -X POST http://localhost:8080/ -H "Content-Type: application/json" -d '{"message": "hello"}'
# Response: {"message": "hello"}
# Headers: X-Request-ID: , X-Echo-Request-Count:

Request Info for GET

For GET requests with no body, the server returns a plain-text summary of the request (method, URI, headers, client IP, timestamp).

Endpoint: GET /
Example:

curl http://localhost:8080/
# Response:
# GET / HTTP/1.1
# Host: localhost:8080
# User-Agent: curl/7.68.0
# Accept: */*
# Client-IP: 127.0.0.1
# Timestamp: 2025-09-14T20:03:00Z

Notes

Request bodies are limited by MAX_BODY_SIZE (default 10MB).
X-Request-ID is auto-generated if not provided and echoed back in response.
Requests are logged if LOG_REQUESTS=true (prints remote method path and a completion line with status and duration). Set LOG_HEADERS to include headers and LOG_BODY to include request body (skipped for /sse; truncated by MAX_LOG_BODY_SIZE). Enable LOG_TRANSACTION=true to print a consolidated request+response transaction block (SSE bodies omitted; bodies truncated by MAX_LOG_BODY_SIZE). Response logging can be enabled via LOG_RESPONSE with LOG_RESPONSE_HEADERS/LOG_RESPONSE_BODY (body truncated by MAX_LOG_BODY_SIZE and skipped for /sse).