3 ms·

The best is to use GET with an If-Modified-Since header: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.25 http://www.w3.org/Protocols/rfc2616/rfc

by vsync 13y ago

The best is to use GET with an If-Modified-Since header: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.25 http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14... This acts like HEAD if the resource has not been modified and like GET if it has. In practice this seems to be the go-to technique for browsers as well.