When building web applications or debugging HTTP traffic, you’ve likely encountered these two HTTP headers: Content-Length and Transfer-Encoding: chunked. These headers serve a fundamental purpose they tell the client how much data to expect and when the response is complete. Understanding the difference between these two approaches is essential for developers working with APIs, streaming data, or optimizing web performance.
The Content-Length header specifies the exact size of the response body in bytes, allowing the client to know precisely how much data to read.