question: public ProxySettings addHeader ( String name , String value ) { if ( name == null || name . length ( ) == 0 ) { return this ; } List < String > list = mHeaders . get ( name ) ; if ( list == null ) { list = new ArrayList < String > ( ) ; mHeaders . put ( name , list ) ; } list . add ( value ) ; return this ; }
target:  Add an additional HTTP header passed to the proxy server.