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Why Does ChatGPT Say Network Error?
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Why Is ChatGPT Login Not Working?
What Are Web Bots? Crawlers, Scrapers, and Bot Traffic Explained
A crawler that discovers product pages, a scraper that extracts prices, an uptime checker that tests a URL every few minutes, and a browser script that clicks through a QA flow can all be called web bots. The label is broad because it describes automation, not one specific job. A more useful way to understand bots is to ask three questions: what task is being repeated, what request pattern the software creates, and what output it produces. That framework makes it easier to tell a crawler from a scraper, understand bot traffic, and diagnose where a workflow is actually failing....
What Does 503 Backend Is Unhealthy Mean?
You receive an HTTP 503 response, but the page does not just say “Service Unavailable.” Instead, it says “backend is unhealthy,” “no healthy upstream,” or “no server is available to handle this request.” Those messages narrow the problem: a front-end layer received the request but could not select or reach a backend that it considered healthy. The useful question is no longer “What does HTTP 503 mean?” It is which backend-selection or health-check layer produced the message, and why did every eligible upstream fail? Quick Answer “503 backend is unhealthy” usually means a reverse proxy, load balancer, CDN, or gateway...
How to Build an HTTP Proxy Server with Node.js
Your Node.js proxy forwards ordinary HTTP requests, but the moment you try an HTTPS URL the request hangs, closes, or never reaches the same request handler. That is the most common point of confusion in a hand-built HTTP proxy: HTTPS does not use the same forwarding path as plain HTTP. The practical fix is to handle CONNECT separately. A working proxy needs one path for normal HTTP requests and another path that opens a TCP tunnel for HTTPS. The steps below start from the failure, reproduce it on Windows, add CONNECT support, and then show how to tell whether a...
How to Use a Proxy with Claude API in Python
A Python application that calls the Claude API normally uses the network route available to the process that runs it. When you need a specific outbound route for development, fixed-egress testing, or an approved network environment, the Anthropic Python SDK can send requests through an explicit proxy instead of relying on the machine's default connection. The current Anthropic Python SDK uses httpx2 for its HTTP layer and lets you customize that layer with DefaultHttpxClient. Anthropic directly documents an HTTP proxy configuration, while HTTPX2 also provides optional SOCKS proxy support. That makes it possible to use either an HTTP proxy or...
Mobile Proxy vs Residential Proxy: How to Choose
Choosing between a mobile proxy and a residential proxy starts with one question: what network identity does your workflow actually need to reproduce? Use a mobile route when the cellular carrier network itself matters. Start with residential when you need a consumer ISP path, broader residential geography, or repeatable web QA across residential locations. The important difference is not which proxy type sounds more “trusted.” Look at what the destination can observe instead: the ASN and organization behind the IP, how the public address is shared, how sessions change, and whether the location signal matches the test. Quick Answer Choose...
Why Perplexity Says It Is Not Available in Your Country
A Perplexity country or region warning looks like a network problem, but the wording alone does not tell you whether the entire service, one feature, one account context, or one network path is responsible. The useful question is not “Which IP should I try next?” It is “What exactly failed, on which Perplexity surface, and what changed immediately before the failure?” That distinction matters because Perplexity Search, mobile apps, organization accounts, the API Console, and individual features can have different access conditions. A route test can reveal a network difference, but it cannot prove what Perplexity’s internal eligibility logic is...