when I add Custom Header to a script, via the "Custom Headers" -> Add
and it is called Cookie with "Header Options" = "Merge Values"
it indeed ads a cookie to each request of the script, unfortunately, it merges it with the other cookies that are set by the server with separator "," instead of the standard separator ";"
e.g. the final Cookie strings looks like:
Cookie: JSESSIONID=xJf3R5S-YXoNAMUgxD2wzw__.flir-prod-com2*;* optimizelySegments=%7B%222070250466%22%3A%22direct%22%2C%222073540371%22%3A%22ff%22%2C%222075260151%22%3A%22false%22%7D*; *optimizelyEndUserId=oeu1442258291821r0.7898720592969987; optimizelyBuckets=%7B%7D*;* optimizelyPendingLogEvents=%5B%5D*, * X-Backend=node1 please note that I have added the Cookie: X-Backend=node1 to the string by setting the "Custom Headers"
this is also documented in ticket - Case #00131956
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