Map function doesn't return default value

@olivia wrote:

I have following HAProxy configuration on 1.8.14

http-request set-var(txn.a) hdr(Origin)
acl x var(txn.a),lower,map(/etc/haproxy/test.map,'false') -m found
http-response    add-header  B  %[var(txn.a)]   if x

I expected the behavior to be that if a request’s Origin header content is present in test.map file, the response will have a new header B with that content. However I’m getting header B set with Origin’s content despite if the content is in test.map or not. What did I do wrong? Thanks for the help in advance.

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