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At Slite, for all outgoing calls we use a sandboxed proxy. It has saved us a few times already. We detailed the trick in a blog post -> https://slite-tech-blog.ghost.io/anti-ssrf-solution/

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This is the path I've seen be fairly robust at a few tech companies I've helped sort out this defense for. I've helped write libraries too but the proxy is the easiest approach when targeting many languages.

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