: read_body( dest = '' )
    ƥƥܥǥ dest  << ᥽åɤȤäƽ񤭤ߤޤ
    Ʊ HTTPResponse ֥ȤФʾƤФ줿硢
    ܤϤʤˤ⤻˰ܤͤ򤽤Τޤ֤ޤ

: read_body {|str| .... }
    ƥƥܥǥ򾯤Ťļƽ缡֥åͿޤ

