If-Range HTTP request header makes a range request conditional: if the condition is fulfilled, the range request is issued, and the server sends back a
Partial Content answer with the appropriate body. If the condition is not fulfilled, the full resource is sent back with a
This header can be used either with the
Last-Modified validator or with
ETag, but not with both.
The most common use case is to resume a download, to guarantee that the stored resource has not been modified since the last fragment has been received.
|Header type||Request header|
|Forbidden header name||no|