Declare that a parameter will be transmitted to the API through the headers.
If the parameter is a string, or any scalar type (float, int, char, ...), it will be send as a string. If it's an aggregate, it will be serialized as JSON. However, passing aggregate via header isn't a good practice and should be avoided for new production code.
.web .common .WebParamAttribute headerParam(
Sönke Ludwig, Михаил Страшун
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