diff --git a/examples/google-installed.rs b/examples/google-installed.rs
index f83f64e..4659d7e 100644
--- a/examples/google-installed.rs
+++ b/examples/google-installed.rs
@@ -3,13 +3,13 @@ extern crate inth_oauth2;
 use std::io;
 
 use inth_oauth2::Client;
-use inth_oauth2::provider::google::Installed;
+use inth_oauth2::provider::google::{Installed, REDIRECT_URI_OOB};
 
 fn main() {
     let client = Client::<Installed>::new(
         String::from("143225766783-ip2d9qv6sdr37276t77luk6f7bhd6bj5.apps.googleusercontent.com"),
         String::from("3kZ5WomzHFlN2f_XbhkyPd3o"),
-        Some(String::from("urn:ietf:wg:oauth:2.0:oob"))
+        Some(String::from(REDIRECT_URI_OOB)),
     );
 
     let auth_uri = client.auth_uri(Some("https://www.googleapis.com/auth/userinfo.email"), None)
diff --git a/src/provider.rs b/src/provider.rs
index f7787da..f41e115 100644
--- a/src/provider.rs
+++ b/src/provider.rs
@@ -43,6 +43,21 @@ pub mod google {
     use token::{Bearer, Expiring, Refresh};
     use super::Provider;
 
+    /// Signals the server to return the authorization code by prompting the user to copy and
+    /// paste.
+    ///
+    /// See [Choosing a redirect URI][uri].
+    ///
+    /// [uri]: https://developers.google.com/identity/protocols/OAuth2InstalledApp#choosingredirecturi
+    pub const REDIRECT_URI_OOB: &'static str = "urn:ietf:wg:oauth:2.0:oob";
+
+    /// Signals the server to return the authorization code in the page title.
+    ///
+    /// See [Choosing a redirect URI][uri].
+    ///
+    /// [uri]: https://developers.google.com/identity/protocols/OAuth2InstalledApp#choosingredirecturi
+    pub const REDIRECT_URI_OOB_AUTO: &'static str = "urn:ietf:wg:oauth:2.0:oob:auto";
+
     /// Google OAuth 2.0 provider for web applications.
     ///
     /// See [Using OAuth 2.0 for Web Server