devprobe is a fast, developer-friendly CLI tool to probe, measure, and load test HTTP services.
It helps you understand where time is spent — DNS, TCP, TLS, HTTP — and how your service behaves under load.
- DNS lookup time
- TCP connection time
- TLS handshake time
- HTTP request latency & status
- Automatic retries
- Request timeouts
- Configurable concurrency
- Total request count
- Success & error counts
- Average latency
- P95 latency
git clone https://github.com/piyushdev04/devprobe.git
cd devprobe
go build -o devprobe ./cmd
./devprobe -tui -timeout 3s -retries 2 -c 20 -n 100 https://example.com- Input Parsing
- Reads the target URL and optional flags: concurrency, total requests, timeout, retries.
- Context Creation
- Creates a context.Context with a timeout to control the maximum duration of each probe or request.
- Concurrent Probes
- Launches goroutines for each probe:
- DNS lookup
- TCP connection
- TLS handshake
- HTTP request
- Each probe runs concurrently and independently.
- Retries
- Each probe uses a retry mechanism.
- On failure, it automatically retries up to the configured number of attempts.
- Time Measurement
- Each probe measures elapsed time using a utility function:
- DNS → time to resolve hostname
- TCP → time to establish connection
- TLS → time to complete handshake
- HTTP → time to receive full response
- Result Collection
- All probe results are sent through a channel.
- Main routine collects and sorts them by execution order for logical output.
- Load Testing
- Spawns a worker pool with size = concurrency.
- Sends total requests to the target URL in parallel.
- Measures latencies, counts successes, and errors.
- Metrics Computation
- After load test completes:
- Average latency = sum of latencies ÷ total requests
- P95 latency = 95th percentile from sorted latency list
- Success / Error counts are calculated
- Output
- Probe times, load test stats, and derived metrics are returned for display or further processing.
- Basic probe
./devprobe https://example.com- Load test with concurrency & total requests
./devprobe -c 20 -n 100 https://example.com- Set timeout per request
./devprobe -timeout 3s https://example.com- Retry on failure
./devprobe -retries 2 https://example.com- Combine concurrency, load, timeout, retries
./devprobe -c 20 -n 100 -timeout 3s -retries 2 https://example.com- Interactive TUI (Terminal UI)
./devprobe -tui https://example.com- TUI + load test + timeout + retries
./devprobe -tui -c 20 -n 100 -timeout 3s -retries 2 https://example.com