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docker-easy-haproxy/tests_e2e/test_proxy_headers.py
Joao Gilberto Magalhaes 776f216a36 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.
2026-02-16 17:26:59 -05:00

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