The HProxy Blog

502 Bad Gateway through a proxy means a gateway got an invalid response from upstream. Learn the five causes, how to tell which gateway failed, and the fix.

Three cURL exit codes cover almost every proxy failure: 7, 56 and 60. What each one means, why proxies trigger it, and the real fix, with copy-paste commands.

DataDome scores your IP reputation, TLS fingerprint, and behavior. Residential proxies clear the reputation gate but not the other two, and this guide covers the rest.

Cloudflare checks IP reputation, TLS and HTTP/2 fingerprints, JS challenges, and behavior. Proxies fix one layer, and the rest is what you still need to scrape past it.

How to use proxies in Selenium for Chrome and Firefox: set the proxy on the driver, fix authenticated proxies with selenium-wire, rotate IPs, and go headless.

How to use proxies with Python requests: the proxies dict, auth, Sessions, SOCKS5, rotating a pool, timeouts and retries, plus verifying your real exit IP.

How to vet a proxy provider before you buy: run trial IPs through a proxy checker and a fraud-score engine, read the ASN mix, and spot the red flags early.

How websites detect proxies: the detection stack from the defender's seat, ASN and IP reputation, TLS and HTTP/2 fingerprints, headers, behavior, and leaks.

HTTP vs SOCKS5 proxy, explained without the marketing: what each protocol does, which layer it works at, how they handle DNS and speed, and which to use.

The PIA proxy is a SOCKS5 endpoint bundled with every Private Internet Access VPN plan: what it is, how to switch it on, and where a dedicated pool beats it.

Ad verification proxies let you load your own campaigns as a real local user, so you see the ads, geos, and landing pages your audience actually gets served.

Proxies for market research let you collect competitor prices, reviews, and ad data at scale across regions, without bans or geo-blocked pages skewing results.

Proxies for price monitoring: how to collect competitor prices at scale without bans, choose residential vs datacenter, and get geo-accurate, current data.

Proxies for SEO: how to scrape SERPs and track rankings at scale without bans, get geo-accurate local results by city, and pick residential over datacenter.

Sneaker proxies decide whether your tasks cop or get cancelled. Which type works for Nike, Shopify and Footsites, how many you need, and how to pace them.

Social media proxies let you run many accounts safely: one clean IP per account, why Instagram and TikTok favor mobile IPs, and how to keep each identity.

Ticketing proxies give each buying session its own clean IP for event drops on Ticketmaster and AXS. Which type works, how many you need, and their limits.

Proxies for travel fare aggregation and scraping: read geo-priced airline and OTA fares, handle heavy anti-bot, and rotate sessions across routes and dates.

The proxy server is refusing connections in Firefox or Tor? Every cause has a fix, from a dead proxy to the wrong protocol, once you know what the error means.

SwitchyOmega setup for Chrome, Edge, and Firefox: install ZeroOmega, add an HTTP or SOCKS5 proxy, switch from the toolbar, and route sites with auto switch.

What is a mobile proxy? A real 4G/5G carrier IP shared by thousands of phone users, so sites can barely block it. How mobile IPs work, rotate, and what they cost.

What is a residential proxy? A real home IP that makes your traffic look like an ordinary person online. How it works, why sites trust it, and what it costs.

reCAPTCHA interrupts your scraping when your IP reputation or behavior looks automated. Knowing what triggers the challenge is how you see it far less often.

Are free proxies safe? An honest guide from a team that runs a free proxy list: what a free proxy can read, inject or steal, and when free is genuinely safe.