[C#]
    string CustomHeaders[string HeaderName];

[VB.NET]
    Property CustomHeaders(ByVal HeaderName As String) As String

[Pascal]
    property CustomHeaders: TElStringList;

[C++]
    void get_CustomHeaders(const sb_u16string &HeaderName, sb_u16string &OutResult);
    void get_CustomHeaders(const std::wstring &HeaderName, std::wstring &OutResult);
    void set_CustomHeaders(const sb_u16string &HeaderName, const sb_u16string &HeaderValue);
    void set_CustomHeaders(const std::wstring &HeaderName, const std::wstring &HeaderValue);

[PHP]
    string get_CustomHeaders(string $HeaderName)
    void set_CustomHeaders(string $HeaderName, string $HeaderValue)

[Java]
    String getCustomHeaders(String HeaderName);
    void setCustomHeaders(String HeaderName, String HeaderValue);