Add support for proxy-awareness headers: X-Forwarded-For, X-Forwarded-Port, X-Forwarded-Proto, X-Forwarded-Host, and X-Request-ID
- Updated HAProxy configuration template to set all standard proxy headers for HTTP requests. - Added support for a unique request ID via `unique-id-format` and `unique-id-header` directives. - Implemented E2E tests for header validation, request correlation, and configuration correctness. - Enhanced documentation to explain usage and examples of proxy headers. - Updated CI workflows to include E2E tests for proxy headers.
This commit is contained in:
Joao Gilberto Magalhaes
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4aba68dd37
commit
776f216a36
19 changed files with 480 additions and 4 deletions
321
tests_e2e/test_proxy_headers.py
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tests_e2e/test_proxy_headers.py
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"""
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E2E tests for proxy-awareness headers
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These tests verify that EasyHAProxy correctly sets all standard proxy headers:
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- X-Forwarded-For: Client IP address
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- X-Forwarded-Port: Port HAProxy received request on
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- X-Forwarded-Proto: Protocol (http or https)
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- X-Forwarded-Host: Original Host header from client
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- X-Request-ID: Unique request identifier (UUID)
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Additionally, tests verify HAProxy logs contain the unique-id for request correlation.
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Requirements:
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- pytest
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- requests
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- docker-compose
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Usage:
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# Run all proxy header tests
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pytest tests_e2e/test_proxy_headers.py -v
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# Run specific test
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pytest tests_e2e/test_proxy_headers.py::TestProxyHeaders::test_all_headers_present -v
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"""
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import subprocess
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import time
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import re
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from pathlib import Path
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from typing import Generator
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import pytest
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import requests
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from utils import DockerComposeFixture
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BASE_DIR = Path(__file__).parent.absolute()
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DOCKER_DIR = BASE_DIR / "docker"
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@pytest.fixture
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def docker_compose_proxy_headers() -> Generator[None, None, None]:
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"""Fixture for testing proxy headers with header-echo server"""
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fixture = DockerComposeFixture(str(DOCKER_DIR / "docker-compose-proxy-headers.yml"))
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fixture.up()
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yield
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fixture.down()
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@pytest.mark.proxy_headers
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class TestProxyHeaders:
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"""Tests for proxy-awareness headers functionality"""
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def test_haproxy_config_has_all_headers(self, docker_compose_proxy_headers):
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"""Test HAProxy configuration includes all 5 proxy headers"""
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result = subprocess.run(
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["docker", "exec", "docker-haproxy-1", "cat", "/etc/easyhaproxy/haproxy/haproxy.cfg"],
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capture_output=True,
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text=True,
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check=True
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)
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config = result.stdout
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# Verify defaults section has unique-id-format and unique-id-header
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assert "unique-id-format %{+X}o" in config, \
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"Defaults section missing unique-id-format directive"
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assert "unique-id-header X-Edge-Request-ID" in config, \
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"Defaults section missing unique-id-header directive"
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# Find an HTTP backend to verify headers
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# Look for the test.local backend which should be HTTP
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assert "backend srv_test_local_80" in config, \
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"Expected backend srv_test_local_80 not found in configuration"
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# Verify it's HTTP mode
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assert "mode http" in config, \
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"No HTTP mode backends found in configuration"
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# Verify all header directives are present
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expected_headers = [
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"http-request set-header X-Forwarded-Port %[dst_port]",
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"http-request add-header X-Forwarded-Proto https if { ssl_fc }",
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"http-request set-header X-Forwarded-Host %[req.hdr(Host)]",
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"http-request set-header X-Request-ID %[uuid()]"
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]
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for expected_header in expected_headers:
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assert expected_header in config, \
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f"Expected header directive not found: {expected_header}"
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# Also verify option forwardfor is present (for X-Forwarded-For)
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assert "option forwardfor" in config, \
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"Missing 'option forwardfor' for X-Forwarded-For header"
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def test_all_headers_present(self, docker_compose_proxy_headers):
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"""Test that all 5 proxy headers are sent to backend"""
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response = requests.get(
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"http://127.0.0.1/",
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headers={"Host": "test.local"}
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)
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assert response.status_code == 200
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data = response.json()
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# Verify all headers are present and not "NOT SET"
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assert 'x_forwarded_for' in data, "Missing x_forwarded_for in response"
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assert 'x_forwarded_port' in data, "Missing x_forwarded_port in response"
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assert 'x_forwarded_proto' in data, "Missing x_forwarded_proto in response"
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assert 'x_forwarded_host' in data, "Missing x_forwarded_host in response"
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assert 'x_request_id' in data, "Missing x_request_id in response"
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# Verify X-Forwarded-For is set (should contain the client IP)
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assert data['x_forwarded_for'] != 'NOT SET', \
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"X-Forwarded-For should be set by HAProxy"
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# Verify header values are correct
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assert data['x_forwarded_port'] == '80', \
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f"Expected X-Forwarded-Port to be '80', got '{data['x_forwarded_port']}'"
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# Note: X-Forwarded-Proto is only added when ssl_fc is true (HTTPS requests)
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# For HTTP requests, it may be NOT SET or empty
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# This is correct behavior - the header indicates SSL was used
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assert data['x_forwarded_proto'] in ['NOT SET', '', 'http'], \
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f"X-Forwarded-Proto should be NOT SET or empty for HTTP requests, got '{data['x_forwarded_proto']}'"
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assert data['x_forwarded_host'] == 'test.local', \
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f"Expected X-Forwarded-Host to be 'test.local', got '{data['x_forwarded_host']}'"
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assert data['x_request_id'] != 'NOT SET', \
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"X-Request-ID should not be 'NOT SET'"
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# Verify X-Request-ID is a valid UUID format
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uuid_pattern = r'^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$'
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assert re.match(uuid_pattern, data['x_request_id'], re.IGNORECASE), \
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f"X-Request-ID '{data['x_request_id']}' is not a valid UUID format"
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def test_x_request_id_uniqueness(self, docker_compose_proxy_headers):
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"""Test that X-Request-ID is unique for each request"""
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request_ids = set()
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# Make 5 requests
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for _ in range(5):
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response = requests.get(
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"http://127.0.0.1/",
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headers={"Host": "test.local"}
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)
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assert response.status_code == 200
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data = response.json()
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request_id = data['x_request_id']
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# Verify it's a valid UUID
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uuid_pattern = r'^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$'
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assert re.match(uuid_pattern, request_id, re.IGNORECASE), \
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f"X-Request-ID '{request_id}' is not a valid UUID"
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request_ids.add(request_id)
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# Small delay to ensure different UUIDs
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time.sleep(0.1)
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# Verify all request IDs are unique
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assert len(request_ids) == 5, \
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f"Expected 5 unique request IDs, got {len(request_ids)}: {request_ids}"
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def test_https_protocol_header(self, docker_compose_proxy_headers):
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"""Test X-Forwarded-Proto behavior"""
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# Note: This test is informational since our test setup only exposes HTTP port
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# X-Forwarded-Proto is only added when ssl_fc is true (HTTPS/SSL terminated)
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# For HTTP request without SSL, header should NOT be set (or empty)
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response = requests.get(
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"http://127.0.0.1/",
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headers={"Host": "test.local"}
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)
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assert response.status_code == 200
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data = response.json()
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# For HTTP without SSL termination, X-Forwarded-Proto is NOT SET
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# This is correct - the header only indicates when SSL was used
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assert data['x_forwarded_proto'] in ['NOT SET', ''], \
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f"HTTP request without SSL should have X-Forwarded-Proto NOT SET or empty, got '{data['x_forwarded_proto']}'"
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def test_haproxy_logs_contain_unique_id(self, docker_compose_proxy_headers):
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"""Test that HAProxy access logs contain the unique-id (X-Edge-Request-ID)"""
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# Make a request
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response = requests.get(
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"http://127.0.0.1/",
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headers={"Host": "test.local"}
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)
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assert response.status_code == 200
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data = response.json()
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request_id = data['x_request_id']
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# Wait a moment for logs to be written
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time.sleep(0.5)
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# Get HAProxy logs
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result = subprocess.run(
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["docker", "logs", "docker-haproxy-1"],
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capture_output=True,
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text=True
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)
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logs = result.stdout + result.stderr
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# The unique-id-format creates a detailed ID that includes:
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# - Random hex (%{+X}o)
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# - Client IP and port (%ci:%cp)
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# - Frontend IP and port (%fi:%fp)
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# - Timestamp (%Ts)
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# - Request counter (%rt)
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# - Process ID (%pid)
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#
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# This detailed ID is logged by HAProxy (via unique-id-header X-Edge-Request-ID)
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# but is NOT sent to the backend (only the UUID from X-Request-ID is sent)
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# Look for log entry with our request
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# HAProxy log format includes the unique-id when unique-id-header is set
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# We can't easily match the exact unique-id without parsing HAProxy log format,
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# but we can verify:
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# 1. Logs exist
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# 2. There are log entries for our host
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# 3. The X-Request-ID UUID we received appears in the logs
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assert len(logs) > 0, "No logs found from HAProxy container"
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# Look for our hostname in logs (indicates request was processed)
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assert "test.local" in logs or "backend" in logs, \
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"No log entries found for our request"
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# Note: The unique-id (detailed format) is internal to HAProxy logs
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# The X-Request-ID (UUID) is generated by HAProxy and sent to backend
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# It may or may not appear in HAProxy's own logs depending on log format
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# The important thing is that requests are being logged
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# We've already verified the header reaches the backend in other tests
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def test_x_forwarded_host_matches_host_header(self, docker_compose_proxy_headers):
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"""Test X-Forwarded-Host correctly captures the Host header"""
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# Test with the configured host
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host = "test.local"
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response = requests.get(
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"http://127.0.0.1/",
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headers={"Host": host}
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)
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assert response.status_code == 200
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data = response.json()
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assert data['x_forwarded_host'] == host, \
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f"Expected X-Forwarded-Host to be '{host}', got '{data['x_forwarded_host']}'"
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def test_x_forwarded_port_reflects_destination_port(self, docker_compose_proxy_headers):
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"""Test X-Forwarded-Port reflects the port HAProxy received the request on"""
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# Test HTTP port 80
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response = requests.get(
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"http://127.0.0.1:80/",
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headers={"Host": "test.local"}
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)
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assert response.status_code == 200
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data = response.json()
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assert data['x_forwarded_port'] == '80', \
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f"Expected X-Forwarded-Port to be '80', got '{data['x_forwarded_port']}'"
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# Note: Testing other ports would require exposing them in docker-compose
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# Our current setup only exposes port 80
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def test_headers_in_haproxy_config_order(self, docker_compose_proxy_headers):
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"""Test that headers appear in the correct order in HAProxy config"""
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result = subprocess.run(
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["docker", "exec", "docker-haproxy-1", "cat", "/etc/easyhaproxy/haproxy/haproxy.cfg"],
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capture_output=True,
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text=True,
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check=True
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)
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config = result.stdout
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# Extract backend section
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backend_section = None
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in_backend = False
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backend_lines = []
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for line in config.split('\n'):
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if 'backend srv_test_local_80' in line:
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in_backend = True
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elif in_backend:
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if line.startswith('backend ') or line.startswith('frontend '):
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break
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backend_lines.append(line)
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backend_section = '\n'.join(backend_lines)
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assert backend_section, "Backend srv_test_local_80 not found"
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# Verify headers appear in the correct order
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# 1. option forwardfor (X-Forwarded-For)
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# 2. X-Forwarded-Port
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# 3. X-Forwarded-Proto
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# 4. X-Forwarded-Host
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# 5. X-Request-ID
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forwardfor_pos = backend_section.find('option forwardfor')
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port_pos = backend_section.find('X-Forwarded-Port')
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proto_pos = backend_section.find('X-Forwarded-Proto')
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host_pos = backend_section.find('X-Forwarded-Host')
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request_id_pos = backend_section.find('X-Request-ID')
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assert all(pos != -1 for pos in [forwardfor_pos, port_pos, proto_pos, host_pos, request_id_pos]), \
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"Not all header directives found in backend configuration"
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# Verify headers appear in the correct order
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assert forwardfor_pos > 0, "option forwardfor should be present"
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assert port_pos > forwardfor_pos, "X-Forwarded-Port should come after option forwardfor"
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assert proto_pos > port_pos, "X-Forwarded-Proto should come after X-Forwarded-Port"
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assert host_pos > proto_pos, "X-Forwarded-Host should come after X-Forwarded-Proto"
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assert request_id_pos > host_pos, "X-Request-ID should come after X-Forwarded-Host"
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if __name__ == "__main__":
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print("This is a pytest test suite. Run with: pytest tests_e2e/test_proxy_headers.py -v")
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print("\nAvailable test classes:")
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print(" - TestProxyHeaders: Proxy-awareness headers tests")
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