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Why are my TCP connections failing during local testing?

Local testing environments are primarily designed to handle HTTP/HTTPS requests. When you send a raw TCP socket request, it often fails because it doesn't adhere to the HTTP protocol structure that the local testing environment expects.

Instead, these raw TCP requests attempt to establish a direct connection to your application or website over the internet. This will not work if your application or website is not publicly accessible, which is typically the case during local development.

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