If-Range
Summary
Asks the server to apply the range request only if the provided ETag or Last-Modified date is current; otherwise send the entire resource.
Overview table
- Direction
- Request
Features
:
Syntax
If-Range = entity-tag / HTTP-date
Usage
A client MUST NOT generate an If-Range header field containing an entity-tag that is marked as weak.
A client MUST NOT generate an If-Range header field containing an HTTP-date unless the client has no entity-tag for the corresponding representation and the date is a strong validator in the sense defined by Section 2.2.2 of RFC7232.