jadler-core/src/main/java/net/jadler/JadlerMocker.java
public void addDefaultHeader(final String name, final String value) {
        Validate.notEmpty(name, "header name cannot be empty");
        Validate.notNull(value, "header value cannot be null, use an empty string instead");
        this.checkConfigurable();
        this.defaultHeaders.put(name, value);
    }
public void addDefaultHeader(final String name, final String value) {
        Validate.notEmpty(name, "header name cannot be empty");
        Validate.notNull(value, "header value cannot be null, use an empty string instead");
        this.checkConfigurable();
        this.defaultHeaders.put(name, value);
    }
Adds a default header to be added to every stub http response.
@param name header name (cannot be empty)
@param value header value (cannot be <tt>null</tt>)