Trusting the root certificate for debugging proxies such as BrowserMob-Proxy on iOS is quite strict in its forward direction. You can download the certificate from ca-certificate-rsa.cer using Device’s Safari, or you can drag the file into the Simulator as well.
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Tap on Allow to install the cert

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Tap
Installon the upper right

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Again, tap
Installon the upper right

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Install

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Once verified, tap on
Done. The certificate is installed

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To trust the certificate as Root Certificate, goto
AboutinGeneral

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Scroll down until you see
Certificate Trust Settings

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Toggle on the
LittleProxy MITMto trust it

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Tap
Continueto trust it as Root Certificate

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Done. Now all traffic can be intercepted by the proxy without any complaint
