... features, 243 flagging, 243 , 244 , 247 , 249 , 257 flags, 251, 257 folders, 243 , 247 , 249 , 260 IMAPClient, 246 –61 imaplib, 244 46 message numbers, 243 , 248 message ranges, 249 searching ... folders, 247 IMAP, 243 , 244 , 247 , 249 , 251, 257 POP, 235, 237, 239 removing flags, 258 FLAGS flag, 249 Flask, 189 flow control, 36, 44 -47 flow coordinates in socket names, 54 flow-based programming, ... libraries, 138, 141 , 161 payloads, 147 persistent connections, 147 POST, 148 –51 raw connections, 5 redirection, 144 47 , 150 relative URLs, 141 response codes, 137, 144 , 153, 185, 229 REST, 151...