Proxy

This section walks you through building and configuring a proxy string. You'll learn how to target specific locations, set up rotation preferences, choose the right protocol, and more. We'll also show you how to make a request using your proxy.

First, it helps to know that every proxy string is made up of four components: host, port, username, and password. These can be arranged in different ways, but throughout this documentation we'll use the following format: HOST:PORT:USERNAME:PASSWORD.

With residential proxies, the password field does more than just authenticate — it's also where you define your proxy configuration settings (such as location targeting and rotation behavior).

Here's an example proxy string configured to target the state of Texas in the USA:

ultra.marsproxies.com:44443:username123:password123_country-us_state-texas

Breaking this down, the string consists of four colon-separated sections:

• Host — ultra.marsproxies.com — the proxy server address you connect to

• Port — 44443 — the port number used for the connection

• Username — username123 — your account username

• Password — password123_country-us_state-texas — your base password followed by configuration parameters

The password section is where all proxy settings are appended. Configuration parameters are added directly after your password using an underscore (_) as a separator. In the example above, _country-us specifies the target country (United States) and _state-texas narrows it down to the state of Texas.

The following pages cover each available configuration option in detail.