public void addAdditionalHeader(String key, String value)
    {
        if (this.additionalHeader == null)
        {
            this.additionalHeader = Maps.newLinkedHashMap();
        }

        this.additionalHeader.put(key, value);
    }
public void addAdditionalHeader ( String key , String value ) { if ( this . additionalHeader == null ) { this . additionalHeader = Maps . newLinkedHashMap ( ) ; } this . additionalHeader . put ( key , value ) ; }
Add value to additional header.

@param key key
@param value value