How to set the Fiddler proxy for macOS terminal


Product Fiddler Everywhere
Product Version 1.0.0 and above
Operating System macOS
3rd-party tools macOS Terminal, iTerm2


The article explains how to set the Fiddler Everywhere proxy for commonly used command-line tools like the default macOS Terminal or iTerm2.

Set Fiddler Proxy (terminal app)

Terminal applications on macOS like the Terminal or iTerm2 are capable of executing HTTP and HTTPS requests. However, in the common case, they won't use the system proxy, and for Fiddler Everywhere to capture traffic that passes through them, they need to set the Fiddler Everywhere proxy explicitly. To achieve that, we could use the export command.

export http_proxy=
export https_proxy=

Once the Fiddler Everywhere proxy is set, we could immediately capture traffic through the terminal application.

Example for making a request while using curl via iTerm2 and intercepting the traffic in Fiddler Everywhere


Result from curl request in Fiddler Everywhere

The export command makes a variable that will be included in a child process environment. It does not affect other already existing environments.

Reset Fiddler Proxy (terminal app)

Once our debugging with Fiddler Everywhere is done, we could reset the current environment's proxy by merely removing the Fiddler Everywhere proxy variables. To achieve that, we could use the unset command.

unset http_proxy
unset https_proxy

If your terminal application is not supporting unset, then you could reset the proxy by assigning an empty string. For example via export http_proxy=""

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