context_builder.go
func (cb *ContextBuilder) SetHeaders(headers map[string]string) *ContextBuilder {
	cb.Headers = headers
	cb.replaceParentHeaders = true
	return cb
}
func (cb *ContextBuilder) SetHeaders(headers map[string]string) *ContextBuilder {
	cb.Headers = headers
	cb.replaceParentHeaders = true
	return cb
}
// SetHeaders sets the application headers for this Context.
// If there is a ParentContext, its headers will be ignored after the call to this method.