Perform the Request Token phase of OAuth, invoking function (defaulting to "request_token" if function is NULL)
.
The value of callback depends on whether you wish to use OAuth 1.0 or 1.0a. If you wish to use 1.0 then callback must be
NULL. To use 1.0a then callback should either be your callback URI, or "oob" (out-of-band).
| this |
an OAuthProxy |
| function |
the function name to invoke |
| callback_uri |
the callback URI |
|
true on success, or false on failure. On failure throws is set. |