Sending message via Facebook throws 500 error - facebook

Question

I am sending a private message via facebook from my app (website). It is an invitation link to the website - however, it gives the following error:
The website encountered an error while retrieving https://www.facebook.com/dialog/send. It may be down for maintenance or configured incorrectly.
Here are some suggestions:
Reload this webpage later.
HTTP Error 500 (Internal Server Error): An unexpected condition
The link invitation link being sent is something like
http://myapp.com/invitation - doesnt work
http://myapp.com - works!
How can I make it work with something after a forward slash?
The actual code:
:javascript
$(function(){
$('li.friend:not(.invited) label').live('click', function() {
FB.init({appId: #{Rails.application.config.fb_app_id}, xfbml: true, cookie: true})
FB.ui({
method: 'send',
display: 'popup',
name: 'New Invitation',
link: 'http://myapp.com/invitation/',
to: this.parentNode.getAttribute("data-id"),
frictionlessRequests:true,
show_error: 'true'
})
$(this).parent().addClass("invited")
$(this).siblings().prop("checked", true)
})
});

Answer 1

You have 'frictionlessRequests' and 'method: send' there; those aren't compatible options. The frictionlessRequests: true, should be in your FB.init() call and affects how the Requests dialog works when pre-filling recipients, what you have there is a mix of parameters from different dialogs
A sample send dialog call is:
FB.ui({
method: 'send',
name: 'People Argue Just to Win',
link: 'http://www.nytimes.com/2011/06/15/arts/people-argue-just-to-win-scholars-assert.html',
});
and a sample apprequests dialog:
FB.ui({
method: 'apprequests',
message: 'Come use this app with me.'
});
}
Also (as you discovered) the link needs to resolve correctly a return a 200 response; if it redirects immediately it won't work correctly