HTTP Entity Header Content-Length
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External
- Content-Length: https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.13
- Message length https://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.4
Internal
Overview
The Content-Length indicates the size of the entity body sent, sent to the recipient, in bytes. In the case of the HEAD method, the size of the entity body that would have been sent had the request been a GET. Note that the meaning of this field is significantly different from the corresponding definition in MIME, where it is an optional field used within the "message/external-body" content-type. In HTTP, it must be sent whenever the message's length can be determined prior to being transferred, unless this is prohibited by the rules in section 4.4.
Process and reconcile "Message Length"