+ will add given headers and expand existing headers with additional values
+ will add given headers and expand existing headers with additional values
+ will add given headers and expand existing headers with additional values
set wil overwrite existing headers rather than extend them with an additional value
set wil overwrite existing headers rather than extend them with an additional value
set wil overwrite existing headers rather than extend them with an additional value
set wil overwrite existing headers rather than extend them with an additional value
Created by peter on 30/10/15.