Proxy plans now up to 15% cheaper
View pricing

Proxy Setup Guides & API Tutorials

Set up, configure, and automate proxies on any device or platform — with copy-paste examples and clear checklists.

Latest Guides & Tutorials Articles

Connection Reset by Peer: Proxy Causes and Fixes

Connection Reset by Peer: Proxy Causes and Fixes

A "connection reset by peer" error means the remote side of a TCP connection sent a reset packet and closed the socket abruptly. When you use a proxy, there are two distinct connections involved, and you need to isolate…

Read article
Cobalt ribbon passing through a metal gateway, with wider frames before it and shorter frames after it.

Chunked Transfer Encoding Through a Proxy: What Can Change Between Connections

Chunked transfer encoding can be removed or recoded by an HTTP-aware intermediary, so client-visible chunks prove framing on one connection only.

Read article
Glass connection loop carrying three requests beside three separate open tubes

HTTP Keep-Alive With Proxies: What the Client Connection Reuses

HTTP keep alive explains why three requests may share one client socket while a proxy manages a separate destination connection with its own lifetime.

Read article
Network analyst comparing encoded response body sizes on a laptop in a daylight office

Accept-Encoding Explained: Encoded vs Decoded Body Size

Accept-Encoding negotiation produced a 30,038-byte gzip body and a 145,043-byte identity body in a ColdProxy HTML test, with equal decoded length and hash.

Read article
Brushed-aluminum square brackets separating an IPv6 literal from a port connector

IPv6 URLs: Why Literal Addresses Need Square Brackets

An IPv6 URL needs square brackets around a literal address so a parser can separate the host from an optional port.

Read article
Layered paper scene showing a fresh response passing a closed cache tray

When to Use Cache-Control: no-store for Live IP Checks

Live IP checks call for Cache-Control: no-store when reused response bytes could make a changed public exit look unchanged.

Read article
A reverse DNS PTR illustration with four IP address tokens connected to a blank identity tag beneath a magnifying lens.

Reverse DNS Lookup for Proxy Exits: What PTR Can Prove

A reverse DNS lookup returned zero PTR names in our direct-connection control, while ColdProxy's public IPv4 endpoint completed with HTTP 200.

Read article
Blue and violet network cables converge on a metal hub beside a magnifying glass and a green-cabled exit device

What Is an ASN? How It Helps Verify a Proxy Exit

What is an ASN useful for? An IP-to-ASN lookup can flag a proxy exit tied to an unexpected network even when its location label looks right elsewhere.

Read article
Postman desktop request routed through a proxy gateway to a verified internet exit

How to Use a Proxy in Postman v12

Postman use proxy setup in v12 takes four steps: open Settings > Proxy, select the route, add credentials, then check the egress address.

Read article

Proxy FAQ — Common Questions

Quick answers to the questions new proxy users ask most often.