My work IT department has blocked SSL on Google to prevent access to Google apps. This has had knock on effect of blocking my access to Gmail (it never worked via http, but using https was fine).
Google Image Proxy is a Google service that anonymizes image requests for Gmail. Filippo Valsorda has a good write up here of how the service works. The important take away is that this service proxies any requests for image resources that are meant to be displayed in Gmail. Google translate as proxy. Note: This trick of using Google translate as proxy server works only when the website has been blocked by the local administrator. If the website is blocked by your ISP Sign in - Google Accounts Google allows users to search the Web for images, news, products, video, and other content.
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Google API Console Google API Console How to Use Google As a Proxy: 8 Steps (with Pictures Feb 19, 2017 Public DNS | Google Developers Configure your network settings to use the IP addresses 22.214.171.124 and 126.96.36.199 as your DNS servers. Or, read our configuration instructions (IPv6 addresses supported too).; If you decide to try Google Public DNS, your client programs will perform all DNS lookups using Google Public DNS.