HTTPower ⚡

HTTPower is a production-ready HTTP client library for Elixir that provides bulletproof HTTP behavior with advanced features like test mode blocking, smart retries, and comprehensive error handling.

Features

🛡️ Production-Ready Reliability

Circuit breaker: Automatic failure detection and recovery with state tracking
Built-in rate limiting: Token bucket algorithm with per-endpoint configuration
Request deduplication: Prevent duplicate operations from double-clicks or race conditions
Comprehensive telemetry: Deep observability with Elixir's :telemetry library
PCI-compliant logging: Automatic sanitization of sensitive data in logs
Request/response correlation: Trace requests with unique correlation IDs
Test mode blocking: Prevents real HTTP requests during testing
Smart retry logic: Intelligent retries with configurable policies
Clean error handling: Never raises exceptions, always returns result tuples
SSL/Proxy support: Full SSL verification and proxy configuration
Request timeout management: Configurable timeouts with sensible defaults

🎯 Perfect For

API integrations - Rate limiting and circuit breakers for third-party APIs
Payment processing - PCI-compliant logging and audit trails
Microservices - Reliability patterns across service boundaries
Financial services - Compliance and observability requirements

Adapter Support

HTTPower supports multiple HTTP clients through an adapter system:

Finch (default) - High-performance HTTP client built on Mint with explicit connection pooling
Req - Batteries-included HTTP client with automatic JSON handling
Tesla - Flexible HTTP client with extensive middleware ecosystem

HTTPower's production features (circuit breaker, rate limiting, PCI logging, smart retries) work consistently across all adapters. For existing Tesla applications, your middleware continues to work unchanged - HTTPower adds reliability on top.

See Migrating from Tesla or Migrating from Req for adapter-specific guidance.

Quick Start

Installation

Add httpower and at least one HTTP client adapter to your dependencies in mix.exs:

def deps do
  [
    {:httpower, "~> 0.15.0"},

    # Choose at least one adapter:
    {:finch, "~> 0.20"},       # Recommended - high performance
    # OR
    {:req, "~> 0.4.0"},        # Batteries-included with auto-JSON
    # OR
    {:tesla, "~> 1.11"}        # If you already use Tesla
  ]
end

Note: HTTPower requires at least one adapter (Finch, Req, or Tesla). If multiple are present, Finch is used by default (can be overridden with the adapter option).

Basic Usage

Direct requests:

# Simple GET request
{:ok, response} = HTTPower.get("https://api.example.com/users")
IO.inspect(response.status)  # 200
IO.inspect(response.body)    # %{"users" => [...]}

# POST with data
{:ok, response} = HTTPower.post("https://api.example.com/users",
  body: "name=John&[email protected]",
  headers: %{"Content-Type" => "application/x-www-form-urlencoded"}
)

Client-based usage:

# Create a configured client
client = HTTPower.new(
  base_url: "https://api.example.com",
  headers: %{"authorization" => "Bearer #{token}"},
  timeout: 30,
  max_retries: 3
)

# Use the client for multiple requests
{:ok, users} = HTTPower.get(client, "/users")
{:ok, user} = HTTPower.get(client, "/users/123")
{:ok, created} = HTTPower.post(client, "/users", body: data)

Global configuration:

# config/config.exs - applies to all requests
config :httpower,
  # Retry configuration
  max_retries: 3,
  retry_safe: false,
  base_delay: 1000,
  max_delay: 30000,

  # Rate limiting
  rate_limit: [
    enabled: true,
    requests: 100,
    per: :minute,
    strategy: :wait
  ],

  # Circuit breaker
  circuit_breaker: [
    enabled: true,
    failure_threshold: 5,
    timeout: 60_000
  ],

  # Logging
  logging: [
    enabled: true,
    level: :info
  ]

# All requests use global configuration
{:ok, response} = HTTPower.get("https://api.example.com/users")

Error handling (never raises!):

case HTTPower.get("https://api.example.com") do
  {:ok, %HTTPower.Response{status: 200, body: body}} ->
    # Success case
    process_data(body)

  {:ok, %HTTPower.Response{status: 404}} ->
    # Handle 404 - still a successful HTTP response
    handle_not_found()

  {:error, %HTTPower.Error{reason: :timeout}} ->
    # Network timeout
    handle_timeout()

  {:error, %HTTPower.Error{reason: :econnrefused}} ->
    # Connection refused
    handle_connection_error()

  {:error, %HTTPower.Error{reason: :network_blocked}} ->
    # Blocked in test mode
    handle_test_mode()
end

Test Mode Integration

HTTPower can completely block real HTTP requests during testing while allowing mocked requests:

# In test_helper.exs
Application.put_env(:httpower, :test_mode, true)

# In your tests
defmodule MyAppTest do
  use ExUnit.Case

  test "API integration with mocking" do
    # Use HTTPower.Test for adapter-agnostic mocking
    HTTPower.Test.stub(fn conn ->
      Plug.Conn.resp(conn, 200, Jason.encode!(%{status: "success"}))
    end)

    {:ok, response} = HTTPower.get("https://api.example.com/test")
    assert response.body == %{"status" => "success"}
  end

  test "real requests are blocked" do
    # Requests without mocks are blocked in test mode
    {:error, error} = HTTPower.get("https://real-api.com")
    assert error.reason == :network_blocked
  end
end

Configuration Options

HTTPower supports configuration at three levels with the following priority:

Per-request options > Per-client options > Global configuration

This allows you to set sensible defaults globally, override them per-client, and further customize individual requests as needed.

PCI-Compliant Logging

HTTPower provides opt-in telemetry-based logging with automatic PCI-compliant data sanitization and structured metadata for log aggregation systems. Simply attach the logger to start logging all HTTP requests and responses.

Quick Start

# In your application.ex
def start(_type, _args) do
  # Attach the logger to enable logging
  HTTPower.Logger.attach()

  # ... rest of your supervision tree
end

Now all HTTP requests will be logged with automatic sanitization and structured metadata:

HTTPower.get("https://api.example.com/users",
  headers: %{"Authorization" => "Bearer secret-token"}
)
# Logs:
# [HTTPower] [req_a1b2c3...] → GET https://api.example.com/users headers=%{"authorization" => "[REDACTED]"}
# [HTTPower] [req_a1b2c3...] ← 200 (45ms) body=%{"users" => [...]}

Structured Logging with Metadata

All log entries include machine-readable metadata via Logger.metadata(), enabling powerful querying in log aggregation systems like Datadog, Splunk, ELK, or Loki:

# Query slow requests
httpower_duration_ms:>1000

# Find all 5xx errors
httpower_status:>=500

# Trace a specific request
httpower_correlation_id:"req_abc123"

# Filter by HTTP method
httpower_method:post

Available metadata:

httpower_correlation_id - Unique request identifier
httpower_event - Event type (:request, :response, :exception)
httpower_method - HTTP method (:get, :post, etc.)
httpower_url - Request URL
httpower_status - HTTP status code (responses only)
httpower_duration_ms - Request duration in milliseconds (responses only)
httpower_headers / httpower_response_headers - Sanitized headers (if enabled)
httpower_body / httpower_response_body - Sanitized body (if enabled)

All metadata respects your logging configuration and sanitizes sensitive data automatically.

Automatic Sanitization

Sensitive data is automatically redacted from logs:

# Authorization headers are sanitized
HTTPower.get("https://api.example.com/users",
  headers: %{"Authorization" => "Bearer secret-token"}
)
# Logs: headers=%{"authorization" => "[REDACTED]"}

# Credit card numbers are sanitized
HTTPower.post("https://payment-api.com/charge",
  body: ~s({"card": "4111111111111111", "amount": 100})
)
# Logs: body={"card": "[REDACTED]", "amount": 100}

What Gets Sanitized

Headers:

Authorization, API-Key, X-API-Key, Token, Cookie, Secret

Body Fields:

password, api_key, token, credit_card, cvv, ssn, pin

Patterns:

Credit card numbers (13-19 digits)
CVV codes (3-4 digits)

Configuration

Configure logging via attach/1 options or Application config:

# Runtime configuration (recommended)
HTTPower.Logger.attach(
  level: :debug,
  log_headers: true,
  log_body: true,
  sanitize_headers: ["x-custom-token"],     # Additional headers to sanitize
  sanitize_body_fields: ["secret_key"]      # Additional body fields to sanitize
)

# Or use Application config (applies when using attach/0)
config :httpower, :logging,
  level: :info,
  log_headers: true,
  log_body: true,
  sanitize_headers: ["x-custom-token"],
  sanitize_body_fields: ["secret_key"]

Important: Custom sanitization fields are additive - they supplement the defaults, not replace them.

Disabling Logging

To disable logging, simply don't attach the logger, or detach it:

# Don't attach in application.ex
# HTTPower.Logger.attach()  # Commented out

# Or detach programmatically
HTTPower.Logger.detach()

Correlation IDs

Every request gets a unique correlation ID for distributed tracing and request tracking:

# Example log output:
[HTTPower] [req_a1b2c3d4e5f6g7h8] → GET https://api.example.com/users
[HTTPower] [req_a1b2c3d4e5f6g7h8] ← 200 (245ms) body=%{"users" => [...]}

Correlation IDs help you:

Track requests across services and logs
Correlate requests with their responses
Debug production issues with distributed tracing
Analyze request flows in microservices

The correlation ID format is req_ followed by 16 hexadecimal characters, ensuring uniqueness across requests.

Rate Limiting

HTTPower includes built-in rate limiting using a token bucket algorithm to prevent overwhelming APIs and respect rate limits.

Token Bucket Algorithm

The token bucket algorithm works by:

Each API endpoint has a bucket with a maximum capacity of tokens
Tokens are refilled at a fixed rate (e.g., 100 tokens per minute)
Each request consumes one token
If no tokens are available, the request either waits or returns an error

Basic Usage

# Global rate limiting configuration
config :httpower, :rate_limit,
  enabled: true,
  requests: 100,        # Max 100 requests
  per: :minute,         # Per minute
  strategy: :wait       # Wait for tokens (or :error to fail immediately)

# All requests automatically respect rate limits
HTTPower.get("https://api.example.com/users")

Per-Client Rate Limiting

# Configure rate limits per client
github_client = HTTPower.new(
  base_url: "https://api.github.com",
  rate_limit: [requests: 60, per: :minute]
)

# This client respects GitHub's 60 req/min limit
HTTPower.get(github_client, "/users")

Per-Request Configuration

# Override rate limit for specific requests
HTTPower.get("https://api.example.com/search",
  rate_limit: [
    requests: 10,
    per: :minute,
    strategy: :error  # Return error instead of waiting
  ]
)

Custom Bucket Keys

# Use custom keys to group requests
HTTPower.get("https://api.example.com/endpoint1",
  rate_limit_key: "example_api",
  rate_limit: [requests: 100, per: :minute]
)

HTTPower.get("https://api.example.com/endpoint2",
  rate_limit_key: "example_api",  # Shares same rate limit
  rate_limit: [requests: 100, per: :minute]
)

Strategies

:wait Strategy (default)

Waits until tokens are available (up to max_wait_time)
Ensures requests eventually succeed
Good for background jobs

config :httpower, :rate_limit,
  strategy: :wait,
  max_wait_time: 5000  # Wait up to 5 seconds

:error Strategy

Returns {:error, :too_many_requests} immediately
Lets your application decide how to handle rate limits
Good for user-facing requests

case HTTPower.get(url, rate_limit: [strategy: :error]) do
  {:ok, response} -> handle_success(response)
  {:error, %{reason: :too_many_requests}} -> handle_rate_limit()
  {:error, error} -> handle_error(error)
end

Rate Limit Headers Parsing

HTTPower can automatically parse rate limit information from HTTP response headers and synchronize with the local rate limiter:

# Parse rate limit headers from response
headers = %{
  "x-ratelimit-limit" => "60",
  "x-ratelimit-remaining" => "42",
  "x-ratelimit-reset" => "1234567890"
}

{:ok, rate_limit_info} = HTTPower.RateLimitHeaders.parse(headers)
# => %{limit: 60, remaining: 42, reset_at: ~U[2009-02-13 23:31:30Z], format: :github}

# Update rate limiter bucket from server headers
HTTPower.Middleware.RateLimiter.update_from_headers("api.github.com", rate_limit_info)

# Get current bucket information
HTTPower.Middleware.RateLimiter.get_info("api.github.com")
# => %{current_tokens: 42.0, last_refill_ms: 1234567890}

Supported header formats:

GitHub/Twitter: X-RateLimit-* headers
RFC 6585/IETF: RateLimit-* headers
Stripe: X-Stripe-RateLimit-* headers
Retry-After: Integer seconds format (on 429/503 responses)

Configuration Options

config :httpower, :rate_limit,
  enabled: true,              # Enable/disable (default: false)
  requests: 100,              # Max requests per time window
  per: :second,               # Time window: :second, :minute, :hour
  strategy: :wait,            # Strategy: :wait or :error
  max_wait_time: 5000         # Max wait time in ms (default: 5000)

Real-World Examples

# GitHub API: 60 requests per minute
github = HTTPower.new(
  base_url: "https://api.github.com",
  rate_limit: [requests: 60, per: :minute]
)

# Stripe API: 100 requests per second
stripe = HTTPower.new(
  base_url: "https://api.stripe.com",
  rate_limit: [requests: 100, per: :second, strategy: :error]
)

# Search endpoints: Lower limits
HTTPower.get("https://api.example.com/search",
  rate_limit: [requests: 10, per: :minute]
)

Circuit Breaker

HTTPower includes circuit breaker pattern implementation to protect your application from cascading failures when calling failing services.

How Circuit Breakers Work

The circuit breaker has three states:

Closed (normal operation)
- Requests pass through normally
- Failures are tracked in a sliding window
- Transitions to Open when failure threshold is exceeded
Open (failing service)
- Requests fail immediately with :service_unavailable
- No actual service calls are made
- After a timeout period, transitions to Half-Open
Half-Open (testing recovery)
- Limited test requests are allowed through
- If they succeed, circuit transitions back to Closed
- If they fail, circuit transitions back to Open

Basic Usage

# Global circuit breaker configuration
config :httpower, :circuit_breaker,
  enabled: true,
  failure_threshold: 5,             # Open after 5 failures
  window_size: 10,                  # Track last 10 requests
  timeout: 60_000,                  # Stay open for 60s
  half_open_requests: 1             # Allow 1 test request in half-open

# All requests automatically use circuit breaker
HTTPower.get("https://api.example.com/users")

Per-Client Circuit Breaker

# Configure circuit breaker per client
payment_gateway = HTTPower.new(
  base_url: "https://api.payment-gateway.com",
  circuit_breaker: [
    failure_threshold: 3,
    timeout: 30_000
  ]
)

# This client has its own circuit breaker
HTTPower.post(payment_gateway, "/charge", body: %{amount: 100})

Per-Request Circuit Breaker Key

# Use custom keys to group requests
HTTPower.get("https://api.example.com/endpoint1",
  circuit_breaker_key: "example_api"
)

HTTPower.get("https://api.example.com/endpoint2",
  circuit_breaker_key: "example_api"  # Shares same circuit breaker
)

Threshold Strategies

Absolute Threshold

config :httpower, :circuit_breaker,
  failure_threshold: 5,        # Open after 5 failures
  window_size: 10              # In last 10 requests

Percentage Threshold

config :httpower, :circuit_breaker,
  failure_threshold_percentage: 50,  # Open at 50% failure rate
  window_size: 10                     # Need 10 requests minimum

Manual Control

# Manually open a circuit
HTTPower.Middleware.CircuitBreaker.open_circuit("payment_api")

# Manually close a circuit
HTTPower.Middleware.CircuitBreaker.close_circuit("payment_api")

# Reset a circuit completely
HTTPower.Middleware.CircuitBreaker.reset_circuit("payment_api")

# Check circuit state
HTTPower.Middleware.CircuitBreaker.get_state("payment_api")
# Returns: :closed | :open | :half_open | nil

Configuration Options

config :httpower, :circuit_breaker,
  enabled: true,                          # Enable/disable (default: false)
  failure_threshold: 5,                   # Failures to trigger open
  failure_threshold_percentage: nil,      # Or use percentage (optional)
  window_size: 10,                        # Sliding window size
  timeout: 60_000,                        # Open state timeout (ms)
  half_open_requests: 1                   # Test requests in half-open

Real-World Examples

Payment Gateway Protection

# Protect against payment gateway failures
payment = HTTPower.new(
  base_url: "https://api.stripe.com",
  circuit_breaker: [
    failure_threshold: 3,      # Open after 3 failures
    timeout: 30_000,           # Try again after 30s
    half_open_requests: 2      # Test with 2 requests
  ]
)

case HTTPower.post(payment, "/charges", body: charge_data) do
  {:ok, response} ->
    handle_payment(response)

  {:error, %{reason: :service_unavailable}} ->
    # Circuit is open, use fallback payment method
    use_fallback_payment_method()

  {:error, error} ->
    handle_payment_error(error)
end

Cascading Failure Prevention

# After 5 consecutive failures, circuit opens
for _ <- 1..5 do
  {:error, _} = HTTPower.get("https://failing-api.com/endpoint")
end

# Subsequent requests fail immediately (no cascading failures)
{:error, %{reason: :service_unavailable}} =
  HTTPower.get("https://failing-api.com/endpoint")

# After 60 seconds, circuit enters half-open
:timer.sleep(60_000)

# Next successful request closes the circuit
{:ok, _} = HTTPower.get("https://failing-api.com/endpoint")

Combining with Exponential Backoff

# Circuit breaker works with existing retry logic
HTTPower.get("https://api.example.com/users",
  # Retry configuration (transient failures)
  max_retries: 3,
  base_delay: 1000,

  # Circuit breaker (persistent failures)
  circuit_breaker: [
    failure_threshold: 5,
    timeout: 60_000
  ]
)

Circuit breaker complements exponential backoff:

Exponential backoff: Handles transient failures (timeouts, temporary errors)
Circuit breaker: Handles persistent failures (service down, deployment issues)
Together they provide comprehensive failure handling

Request Deduplication

HTTPower provides in-flight request deduplication to prevent duplicate side effects from double-clicks, race conditions, or concurrent identical requests.

How Deduplication Works

When deduplication is enabled, HTTPower:

Fingerprints each request using a hash of method + URL + body
Tracks in-flight requests - first occurrence executes normally
Duplicate requests wait - subsequent identical requests wait for the first to complete and receive its response
Auto-cleanup - tracking data is removed after 500ms

This is client-side deduplication that prevents duplicate requests from ever leaving your application.

Basic Usage

# Enable deduplication for a request
HTTPower.post("https://api.example.com/charge",
  body: Jason.encode!(%{amount: 100}),
  deduplicate: true  # Prevents double-clicks from sending duplicate charges
)

Global Configuration

# config/config.exs
config :httpower, :deduplicate,
  enabled: true

# All requests now use deduplication
HTTPower.post("https://api.example.com/order", body: order_data)

Custom Deduplication Keys

By default, deduplication uses method + URL + body as the fingerprint. You can override this:

# Use a custom key (e.g., user action ID)
HTTPower.post("https://api.example.com/charge",
  body: payment_data,
  deduplicate: [
    enabled: true,
    key: "user:#{user_id}:action:#{action_id}"
  ]
)

Use Cases

Prevent Double-Clicks

def process_payment(user_id, amount) do
  # Even if user clicks "Pay" button multiple times,
  # only one charge request is sent
  HTTPower.post("https://api.payment.com/charge",
    body: Jason.encode!(%{user_id: user_id, amount: amount}),
    deduplicate: true
  )
end

Prevent Race Conditions

# Multiple processes trying to create the same resource
# Only one request executes, others wait and share the response
Task.async(fn ->
  HTTPower.post("/api/users", body: user_data, deduplicate: true)
end)

Task.async(fn ->
  HTTPower.post("/api/users", body: user_data, deduplicate: true)
end)

Deduplication vs Idempotency Keys

Request Deduplication (Client-Side)

Prevents duplicate requests from leaving the client
Works with any API
Scope: Single HTTPower instance
Duration: Very short (seconds)

Idempotency Keys (Server-Side)

Server prevents duplicate processing
Requires API support
Scope: Cross-instance, persistent
Duration: Hours/days

Best Practice: Use Both

# Generate idempotency key for server-side deduplication
idem_key = UUID.uuid4()

HTTPower.post("/charge",
  headers: %{"Idempotency-Key" => idem_key},  # Server-side
  body: payment_data,
  deduplicate: true,    # Client-side - prevents unnecessary network calls
  max_retries: 3        # Safe to retry with same idem key
)

Defense in Depth:

Client deduplication = First line of defense (no network call)
Idempotency key = Second line of defense (server deduplication)

Observability & Telemetry

HTTPower emits comprehensive telemetry events using Elixir's :telemetry library for deep observability into HTTP requests, retries, rate limiting, circuit breakers, and deduplication.

Quick Start

:telemetry.attach_many(
  "httpower-handler",
  [
    [:httpower, :request, :start],
    [:httpower, :request, :stop],
    [:httpower, :retry, :attempt]
  ],
  fn event, measurements, metadata, _config ->
    IO.inspect({event, measurements, metadata})
  end,
  nil
)

Available Events

HTTP Request Lifecycle:

[:httpower, :request, :start] - Request begins
[:httpower, :request, :stop] - Request completes (includes duration, status, retry_count)
[:httpower, :request, :exception] - Unhandled exception

Retry Events:

[:httpower, :retry, :attempt] - Retry attempt (includes attempt_number, delay_ms, reason)

Rate Limiter:

[:httpower, :rate_limit, :ok] - Request allowed
[:httpower, :rate_limit, :wait] - Waiting for tokens
[:httpower, :rate_limit, :exceeded] - Rate limit exceeded

Circuit Breaker:

[:httpower, :circuit_breaker, :state_change] - State transition (includes from_state, to_state, failure_count)
[:httpower, :circuit_breaker, :open] - Request blocked by open circuit

Deduplication:

[:httpower, :dedup, :execute] - First request executes
[:httpower, :dedup, :wait] - Duplicate waits for in-flight request
[:httpower, :dedup, :cache_hit] - Returns cached response

Integration Examples

Prometheus Metrics:

# Using telemetry_metrics_prometheus
distribution(
  "httpower.request.duration",
  event_name: [:httpower, :request, :stop],
  measurement: :duration,
  unit: {:native, :millisecond},
  tags: [:method, :status]
)

OpenTelemetry:

# Using opentelemetry_telemetry
OpentelemetryTelemetry.register_application_tracer(:httpower)

Custom Logging:

:telemetry.attach(
  "httpower-logger",
  [:httpower, :request, :stop],
  fn _event, measurements, metadata, _config ->
    duration_ms = System.convert_time_unit(measurements.duration, :native, :millisecond)
    Logger.info("HTTP #{metadata.method} #{metadata.url} - #{metadata.status} (#{duration_ms}ms)")
  end,
  nil
)

📖 Full Observability Guide - Complete event reference, measurements, metadata, and integration examples for Prometheus, OpenTelemetry, and Phoenix LiveDashboard.

Development

# Install dependencies
mix deps.get

# Run tests
mix test

# Generate docs
mix docs

# Check coverage
mix test --cover

Contributing

Fork the repository
Create a feature branch
Add tests for your changes
Ensure all tests pass with mix test
Submit a pull request

License

MIT License

HTTPower: Because your HTTP requests deserve to be as powerful as they are reliable. ⚡

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CHANGELOG.md		CHANGELOG.md
LICENSE		LICENSE
README.md		README.md
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HTTPower ⚡

Features

🛡️ Production-Ready Reliability

🎯 Perfect For

Table of Contents

Adapter Support

Quick Start

Installation

Basic Usage

Test Mode Integration

Configuration Options

PCI-Compliant Logging

Quick Start

Structured Logging with Metadata

Automatic Sanitization

What Gets Sanitized

Configuration

Disabling Logging

Correlation IDs

Rate Limiting

Token Bucket Algorithm

Basic Usage

Per-Client Rate Limiting

Per-Request Configuration

Custom Bucket Keys

Strategies

Rate Limit Headers Parsing

Configuration Options

Real-World Examples

Circuit Breaker

How Circuit Breakers Work

Basic Usage

Per-Client Circuit Breaker

Per-Request Circuit Breaker Key

Threshold Strategies

Manual Control

Configuration Options

Real-World Examples

Request Deduplication

How Deduplication Works

Basic Usage

Global Configuration

Custom Deduplication Keys

Use Cases

Deduplication vs Idempotency Keys

Observability & Telemetry

Quick Start

Available Events

Integration Examples

Development

Contributing

License

About

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