http request

What Are Some Common HTTP Status Codes?

Understanding HTTP status codes can help diagnose issues in email marketing campaigns:
200 OK: The request was successful.
301 Moved Permanently: The resource has been moved to a new URL.
400 Bad Request: The server could not understand the request due to invalid syntax.
401 Unauthorized: Authentication is required and has failed or has not yet been provided.
404 Not Found: The server cannot find the requested resource.
500 Internal Server Error: The server encountered an unexpected condition.

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