[Alegun]

Вроде надо так

Код:

... 
        addheader:='Accept: */*';
        HttpAddRequestHeaders(hRequest, Pointer(addheader), Length(addheader), HTTP_ADDREQ_FLAG_ADD);
        addheader:= 'Content-Type: application/x-www-form-urlencoded';
        HttpAddRequestHeaders(hRequest, Pointer(addheader), Length(addheader), HTTP_ADDREQ_FLAG_ADD);
        addheader:= 'Accept-Language: ru-ru,ru;q=0.8,en-us;q=0.5,en;q=0.3';
        HttpAddRequestHeaders(hRequest, Pointer(addheader), Length(addheader), HTTP_ADDREQ_FLAG_ADD);
        addheader:= 'Accept-Charset: windows-1251,utf-8;q=0.7,*;q=0.7';
        HttpAddRequestHeaders(hRequest, Pointer(addheader), Length(addheader), HTTP_ADDREQ_FLAG_ADD);
...