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// http header · request header

Content-Length

Size of the body in bytes

What the Content-Length header does

Content-Length is the size of the body in bytes. It lets the receiver know when the message is complete and enables progress indicators. With chunked transfer encoding it's omitted, since the length isn't known up front.

Example

Content-Length: 348

Where it's used

Content-Length is a request header. Request headers are sent by the client to describe the request and what the client can accept.

Other request headers

Accept Accept-Encoding Accept-Language Authorization Content-Type Content-Length Cookie Host Origin Referer User-Agent If-None-Match Range
TOOL

HTTP Headers Parser

Turn a block of raw headers into readable JSON.

REFERENCE

All HTTP Headers

Common request, response, caching, CORS, and security headers.

GUIDE

How to Read and Parse HTTP Headers

The anatomy of headers and how to work with them.