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Authenticated proxying and destination authentication are two different credential exchanges. A proxy username and password authenticate your PHP client to the intermediary; an API key, Basic login, bearer token, or NTLM credential authenticates the request to the destination server. Configure them in the option supported by your HTTP client, and verify the active transport before assuming that a setting works.
This guide covers the documented behavior of Guzzle and Symfony HttpClient, including bypass rules, credential scope, transport differences, testing, and failure recovery.
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Choose the client before choosing the option
Guzzle and Symfony HttpClient do not share configuration names. Identify the package and version first, then check which handler or transport is actually running. A setting documented for Guzzle’s cURL handler is not automatically valid for Symfony’s native streams or Amp transport.
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| Concern | Guzzle | Symfony HttpClient |
|---|---|---|
| Proxy routing | proxy; one URL or a map for http and https |
proxy; no_proxy for comma-separated bypass hosts |
| Proxy credentials | Documented in the proxy URL as username and password | Current guide documents routing but does not establish authenticated-proxy credential syntax |
| Destination authentication | auth request option |
auth_basic, auth_bearer, or auth_ntlm |
| Transport caveat | Digest and NTLM destination auth require the cURL handler | NTLM requires the cURL transport; cURL-specific settings use extra.curl |
Symfony’s documentation says the component honors operating-system proxy environment variables by default (Symfony HTTP Client documentation). Guzzle also has environment-related behavior, but its request reference makes the handling of explicit bypass values important: when you provide a proxy request option, provide the no value yourself if you want the NO_PROXY exclusions applied.
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How proxy authentication works
Proxy credentials
For an HTTP proxy, the client first connects to the proxy. The proxy may request credentials before forwarding the request. Those credentials belong to the proxy URL or proxy-specific configuration, not to the origin URL.
Origin credentials
After the proxy permits forwarding, the destination server can require its own authentication. A destination’s Basic, Digest, bearer, or NTLM exchange is configured separately. Never put an origin API token in a proxy URL, and never assume a destination auth option authenticates the proxy.
HTTPS through a proxy
For an HTTPS destination, the client normally asks the proxy to establish a tunnel and then performs TLS with the destination. Proxy authentication and destination TLS validation remain separate. Do not turn off certificate verification as a shortcut for a 407 or proxy-login error.
Guzzle: use the documented authenticated proxy URL
Guzzle’s stable request-options reference explicitly permits a proxy URL containing a scheme, username, password, host, and port, such as http://username:[email protected]:10 (Guzzle request options). Use placeholders in source and load real secrets from a secret manager or environment.
One proxy for both schemes
<?php
require __DIR__ . '/vendor/autoload.php';
use GuzzleHttpClient;
$proxyUser = getenv('PROXY_USER');
$proxyPass = getenv('PROXY_PASS');
$proxyHost = getenv('PROXY_HOST');
$proxyPort = getenv('PROXY_PORT') ?: '8080';
if ($proxyUser === false || $proxyPass === false || $proxyHost === false) {
throw new RuntimeException('Set PROXY_USER, PROXY_PASS, and PROXY_HOST');
}
$proxy = 'http://' . rawurlencode($proxyUser) . ':' . rawurlencode($proxyPass)
. '@' . $proxyHost . ':' . $proxyPort;
$client = new Client([
'proxy' => $proxy,
'timeout' => 30,
]);
$response = $client->get('https://example.com/status');
echo $response->getStatusCode() . PHP_EOL;
echo $response->getBody();
URL-encode usernames and passwords. A password containing @, :, or a slash can otherwise change how the proxy URL is parsed.
Different routes for HTTP and HTTPS
$client = new GuzzleHttpClient([
'proxy' => [
'http' => $httpProxyUrl,
'https' => $httpsProxyUrl,
'no' => ['localhost', '127.0.0.1', '.internal.example'],
],
]);
The no list is deliberate. If your process relies on NO_PROXY, parse that environment variable and pass the resulting exclusions when supplying this request option; do not assume an explicit map will automatically preserve it.
Add destination authentication separately
$response = $client->get('https://api.example.com/private', [
'auth' => [getenv('ORIGIN_USER'), getenv('ORIGIN_PASS'), 'basic'],
]);
Guzzle’s auth option configures authentication to the destination request. Basic is the default. Digest and NTLM are supported only by the cURL handler, so select and verify that handler when those schemes are required.
Guzzle troubleshooting signals
- 407 Proxy Authentication Required: the request reached the proxy but credentials were missing, malformed, rejected, or sent to the wrong proxy.
- 401 Unauthorized: the destination rejected origin credentials; changing the proxy password will not fix it.
- Connection refused or timeout: check proxy host, port, firewall rules, and whether the proxy accepts the requested scheme.
- Unexpected direct connection: inspect the
noexclusions and any environment variables that set or override proxy routing.
Symfony HttpClient: configure routing, then verify credential support
Symfony’s current guide documents proxy for routing and no_proxy for a comma-separated bypass list. It also documents destination authentication through auth_basic, auth_bearer, and auth_ntlm, globally or per request. Request authentication can override global authentication, and HttpClient::createForBaseUri() scopes credentials to the configured destination host (Symfony HTTP Client documentation).
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The reviewed Symfony guide does not state whether embedded username-and-password credentials in its proxy URL are accepted consistently across native streams, cURL, and Amp. Therefore, do not label auth_basic as proxy authentication or publish a Symfony proxy-password recipe without confirming the exact Symfony version and transport you deploy.
Documented routing and destination authentication
<?php
require __DIR__ . '/vendor/autoload.php';
use SymfonyComponentHttpClientHttpClient;
$client = HttpClient::create([
'proxy' => getenv('OUTBOUND_PROXY'),
'no_proxy' => 'localhost,127.0.0.1,.internal.example',
]);
$response = $client->request('GET', 'https://api.example.com/private', [
'auth_basic' => [getenv('ORIGIN_USER'), getenv('ORIGIN_PASS')],
]);
echo $response->getStatusCode() . PHP_EOL;
echo $response->getContent();
This example proves the routing and origin-auth configuration, not a universal authenticated-proxy syntax. Confirm proxy credentials with the transport-specific Symfony documentation and a controlled request before shipping.
Transport selection matters
Symfony can use native PHP streams, cURL, or Amp, with automatic selection and explicit client classes available. NTLM destination authentication requires cURL. The guide also permits supported cURL settings through extra.curl; that facility does not, by itself, establish a portable proxy-authentication recipe.
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Use HttpClient::createForBaseUri() when a client should send destination credentials only to one configured origin. Keep proxy secrets in deployment configuration, never in a committed service definition or verbose request log.
Environment variables and bypass rules
Record the effective proxy configuration at startup without printing passwords. Check commonly supplied variables such as HTTP_PROXY, HTTPS_PROXY, and NO_PROXY, while remembering that exact precedence can depend on the client and transport.
- Use a bypass entry for loopback addresses and internal services that must not leave the network.
- Decide whether a leading-dot domain means the parent domain and subdomains in your client, then test it.
- Do not include credentials in exception messages, traces, screenshots, or support tickets.
- After changing proxy settings, restart long-running workers so they do not retain stale configuration.
A repeatable test procedure
- Confirm the destination works without a proxy in the same runtime, if policy permits.
- Confirm the proxy host and port from the deployment network, not only from a developer laptop.
- Send a harmless request through the proxy and record status code, elapsed time, and the client transport, excluding secret headers.
- Test one HTTPS destination and one HTTP destination if both are needed.
- Test each bypass host and verify that it follows the intended direct or proxied path.
- Test bad proxy credentials and confirm the application reports a controlled 407 rather than retrying indefinitely.
- Test destination authentication independently with a known-good origin credential.
Common failure modes and fixes
| Symptom | Likely cause | Fix |
|---|---|---|
| 407 from proxy | Wrong proxy secret, unsupported credential syntax, or wrong proxy route | Verify the client-specific syntax, URL-encode values, and confirm the active transport |
| 401 from origin | Destination credentials are wrong or missing | Configure Guzzle auth or Symfony destination-auth options separately |
| Works in Guzzle, fails in Symfony | Option names and transport behavior differ | Use Symfony’s documented routing options and verify proxy credential support for that version/transport |
| Internal host goes through proxy | Missing or incorrectly formatted bypass entry | Set Guzzle no or Symfony no_proxy explicitly and test the hostname form used by the request |
| NTLM negotiation fails | Non-cURL handler or unavailable cURL support | Use the required cURL handler/transport and verify the PHP cURL extension |
| Redirect leaks credentials | Redirect crosses hosts or credential scope is too broad | Restrict destination credentials to the intended host, review redirect policy, and avoid logging authorization headers |
| Intermittent timeouts | Proxy overload, DNS differences, connect/read timeout mismatch, or stale worker settings | Measure connect and total time separately where supported, check proxy health with the network team, and restart workers after configuration changes |
Performance, reliability, and security practices
- Reuse clients: a long-lived Guzzle or Symfony client can reuse connections, but rotate it when proxy credentials or routing policy changes.
- Set bounded timeouts: use a connect timeout and an overall request timeout appropriate to the proxy and destination; never allow unbounded waits in workers.
- Retry selectively: retry transient network failures only when the operation is safe to repeat. Do not blindly retry 401 or 407 responses.
- Protect logs: redact proxy URLs, authorization headers, cookies, and exception context that may contain full request URLs.
- Validate TLS normally: install an approved enterprise CA when a managed proxy performs inspection; disabling verification removes an important security control.
- Pin configuration by environment: development, staging, and production may require different proxy routes and bypass lists.
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See the ScreenshotNeo API documentation for all options. A cURL call is:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpEquivalent PHP:
<?php
$r = requests_get('https://api.screenshotneo.com/v1/shot');
Use a normal PHP HTTP client for the actual request:
<?php
$url = 'https://api.screenshotneo.com/v1/shot';
$query = http_build_query([
'access_key' => getenv('SCREENSHOTNEO_KEY'),
'url' => 'https://stripe.com',
]);
$data = file_get_contents($url . '?' . $query);
file_put_contents('shot.webp', $data);
Python and Node.js equivalents are:
import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
open("shot.webp", "wb").write(r.content)
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
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FAQ
Can I use one password for the proxy and the API server?
You can only do so if both systems independently accept the same credential, but treating them as separate secrets is safer and avoids sending a destination credential to an intermediary.
Does a 407 mean the destination is down?
No. A 407 is generated by the proxy before the destination request is authorized. Diagnose proxy reachability and credentials first.
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No. Force cURL when a required authentication scheme or transport feature depends on it; otherwise choose the transport that your supported client configuration and deployment can reliably operate.
Where should proxy secrets live?
Use environment injection or a dedicated secret store with restricted permissions. Keep placeholders in examples and redact values from logs.
Frequently Asked Questions
Can a proxy URL contain special characters in its password?
Yes, for clients that document URL-embedded credentials such as Guzzle, percent-encode reserved characters before constructing the URL.
What should I test after rotating proxy credentials?
Restart long-lived workers, run an HTTPS request, verify bypass hosts, and confirm that failed credentials produce a controlled 407 without leaking secrets.
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