Deleting headers from request-config instead of flow in MULE 4 - mule

Question

I'm trying to find solution for deleting request headers in MULE 4 by more effective way then actual.
In request config is possible to have <http:default-headers />, but I can't find way to delete headers from here. So I'm deleting headers in flow ->
like this:
<http:headers>#[attributes.headers -- ["host", "http.headers"]]</http:headers>
Full version of flow is here:
<flow name="WS_name">
<http:listener path="someway/*" config-ref="External_Listener" doc:name="HTTP">
<http:response statusCode="#[vars.httpStatus default 200]">
<http:headers>#[vars.outboundHeaders default {}]</http:headers>
</http:response>
<http:error-response statusCode="#[vars.httpStatus default 500]">
<http:body>#[payload]</http:body>
<http:headers>#[vars.outboundHeaders default {}]</http:headers>
</http:error-response>
</http:listener>
<http:request method="#[attributes.method]" sendBodyMode="AUTO" config-ref="HTTPS_Request_configuration_proxy" url="#['https://${endpoint.WS_name.host}:${endpoint.WS_name.port}' ++ '${endpoint.WS_name.path}/']">
<http:headers>#[attributes.headers -- ["host", "http.headers"]]</http:headers>
</http:request>
If anyone have better solution, please, share it.

Answer 1

What you are doing is fine. If you want to do that in the flow outside of the http:request, then you can. All the http:headers expects is a map. So here is an example of using a var:
<set-variable variableName="myAttributes" value="#[attributes.headers -- ['host', 'http.headers']]" />
<http:request method="#[attributes.method]" sendBodyMode="AUTO" config-ref="HTTPS_Request_configuration_proxy"
url="#['https://${endpoint.WS_name.host}:${endpoint.WS_name.port}' +++ '${endpoint.WS_name.path}/']">
<http:headers>#[vars.myAttributes]</http:headers>
</http:request>