ɪnðə fˈɜːst kˈeɪs, ðə pɹˈɑːksi pɹɪtˈɛndz təbi ðɪ ˈɑːpəzˌɪt ɛndpˈɔɪnt ʌvðə kənˈɛkʃən ɪn ˈiːtʃ dᵻɹˈɛkʃən, lˈɪɾɚɹəli splˈɪɾɪŋ ðə kənˈɛkʃən ˌɪntʊ tˈuː.
In the first case, the proxy pretends to be the opposite endpoint of the connection in each direction, literally splitting the connection into two.