Minor Description
The camel-ahc component does not support multi-value HTTP headers properly.
If the camel message contains a header with a list value the list is converted into a String before setting it to a header, which is not the proper format for a multi-value http header.
Example: If the camel header named "to" has a value of type List<String>, which contains the elements "foo" and "bar" the generated HTTP header named "to" will have the value "[foo, bar]"
According to RFC 7230 section 3.2.2 this is the wrong format. There should be a single line generated from it, but the list should simply be comma separated ("foo, bar" without the square brackets).