The HTTP Content-Range header is used when partial messages are being transmitted, and it indicates where within the full message’s body the content belongs.
When a message is split into chunks, each is referred to as a range. The Content-Range header is sent by the server to indicate where, within the full message’s body, the current message’s content belongs. The directives are
The unit directive is usually
range-end directives correspond to the zero-based start and end indexes of the data within the full message. The
size refers to the total length of the document, although an asterisk
* may be used if the
size is unknown. A streaming document, for example, will have an unknown
In these examples, the range indicated is from bytes 1000 through 2000, inclusive. In the first example, the
size is indicated as 65000, whereas in the second example, the
size is unknown.
Content-Range: bytes 1000-2000/65000 Content-Range: bytes 1000-2000/*
The Content-Range header indicates the
bytes range that the current message represents within the entirety of the main resource.