不会是++--||的画上去的吧?

比如:

     +----------+          Client Identifier      +---------------+
     |         -+----(A)--- & Redirect URI ------>|               |
     | End-user |                                 | Authorization |
     |    at    |<---(B)-- User authenticates --->|     Server    |
     | Browser  |                                 |               |
     |         -+----(C)-- Authorization Code ---<|               |
     +-|----|---+                                 +---------------+
       |    |                                         ^      v
      (A)  (C)                                        |      |
       |    |                                         |      |
       ^    v                                         |      |
     +---------+                                      |      |
     |         |>---(D)-- Client Credentials, --------'      |
     |   Web   |          Authorization Code,                |
     |  Client |            & Redirect URI                   |
     |         |                                             |
     |         |<---(E)----- Access Token -------------------'
     +---------+       (w/ Optional Refresh Token)


                         Figure 4: Web Server Flow

额,,设置了字体,好像不起作用哦......