diff --git a/grails-app/services/grails/plugin/springsecurity/oauth2/SpringSecurityOauth2BaseService.groovy b/grails-app/services/grails/plugin/springsecurity/oauth2/SpringSecurityOauth2BaseService.groovy
index 939adad..fbe25dc 100644
--- a/grails-app/services/grails/plugin/springsecurity/oauth2/SpringSecurityOauth2BaseService.groovy
+++ b/grails-app/services/grails/plugin/springsecurity/oauth2/SpringSecurityOauth2BaseService.groovy
@@ -122,6 +122,15 @@ class SpringSecurityOauth2BaseService {
         return oAuthToken
     }
 
+    private String buildUrl(OAuth2ProviderService providerService, String baseURL, String type, String alternative = null) {
+        String configValue = getConfigValue(providerService.providerID, type)
+        if (!configValue?.startsWith("/")) {
+            configValue
+        } else {
+            configValue ? baseURL + configValue : alternative
+        }
+    }
+
     /**
      * Register the provider into the service
      * @param providerService
@@ -133,11 +142,11 @@ class SpringSecurityOauth2BaseService {
             log.warn("There is already a provider with the name " + providerService.getProviderID() + " registered")
         } else {
             String baseURL = getBaseUrl()
-            def callbackURL = getConfigValue(providerService.providerID, "callback") ? baseURL + getConfigValue(providerService.providerID, "callback") : baseURL + "/oauth2/" + providerService.getProviderID() + "/callback"
+            def callbackURL = buildUrl(providerService, baseURL, "callback", baseURL + "/oauth2/" + providerService.getProviderID() + "/callback")
             log.debug("Callback URL: " + callbackURL)
-            def successUrl = getConfigValue(providerService.providerID, "successUri") ? baseURL + getConfigValue(providerService.providerID, "successUri") : null
+            def successUrl = buildUrl(providerService, baseURL, "successUri")
             log.debug("Success URL: " + successUrl)
-            def failureUrl = getConfigValue(providerService.providerID, "failureUri") ? baseURL + getConfigValue(providerService.providerID, "failureUri") : null
+            def failureUrl = buildUrl(providerService, baseURL, "failureUri")
             log.debug("Failure URL: " + failureUrl)
             def scopes = getConfigValue(providerService.providerID, "scopes") ?: null
             log.debug("Additional Scopes: " + scopes)
@@ -189,7 +198,7 @@ class SpringSecurityOauth2BaseService {
      */
     String getFailureUrl(String providerName) {
         def providerService = getProviderService(providerName)
-        providerService.failureUrl ?: baseUrl + "/oauth2/" + providerName + "/success"
+        providerService.failureUrl ?: baseUrl + "/oauth2/" + providerName + "/failure"
     }
 
     /**
diff --git a/src/test/groovy/grails/plugin/springsecurity/oauth2/SpringSecurityOauth2BaseServiceSpec.groovy b/src/test/groovy/grails/plugin/springsecurity/oauth2/SpringSecurityOauth2BaseServiceSpec.groovy
new file mode 100644
index 0000000..cbff6c4
--- /dev/null
+++ b/src/test/groovy/grails/plugin/springsecurity/oauth2/SpringSecurityOauth2BaseServiceSpec.groovy
@@ -0,0 +1,84 @@
+package grails.plugin.springsecurity.oauth2
+
+import com.github.scribejava.apis.GoogleApi20
+import com.github.scribejava.core.builder.api.DefaultApi20
+import com.github.scribejava.core.model.OAuth2AccessToken
+import grails.plugin.springsecurity.oauth2.service.OAuth2AbstractProviderService
+import grails.plugin.springsecurity.oauth2.token.OAuth2SpringToken
+import grails.testing.gorm.DataTest
+import grails.testing.services.ServiceUnitTest
+import spock.lang.Specification
+
+class SpringSecurityOauth2BaseServiceSpec extends Specification implements DataTest, ServiceUnitTest<SpringSecurityOauth2BaseService> {
+
+    String providerName = "google"
+    String propertyNamespace = "grails.plugin.springsecurity.oauth2.providers"
+    OAuth2AbstractProviderService oauthProviderService
+
+    def setup() {
+        oauthProviderService = new OAuth2AbstractProviderService() {
+
+            @Override
+            String getProviderID() {
+                providerName
+            }
+
+            @Override
+            Class<? extends DefaultApi20> getApiClass() {
+                return GoogleApi20
+            }
+
+            @Override
+            String getProfileScope() {
+                return null
+            }
+
+            @Override
+            String getScopes() {
+                return null
+            }
+
+            @Override
+            String getScopeSeparator() {
+                return null
+            }
+
+            @Override
+            OAuth2SpringToken createSpringAuthToken(OAuth2AccessToken accessToken) {
+                return null
+            }
+        }
+    }
+
+    void "relative URLs"() {
+        given:
+        grailsApplication.config."${propertyNamespace}.${providerName}.api_key" = "api_key"
+        grailsApplication.config."${propertyNamespace}.${providerName}.api_secret" = "api_secret"
+        grailsApplication.config."${propertyNamespace}.${providerName}.successUri" = "/oauth2/${providerName}/success"
+        grailsApplication.config."${propertyNamespace}.${providerName}.failureUri" = "/oauth2/${providerName}/failure"
+        grailsApplication.config."${propertyNamespace}.${providerName}.callback" = "/oauth2/${providerName}/callback"
+        service.registerProvider(oauthProviderService)
+
+        expect:
+        service.getFailureUrl(providerName) == "http://localhost:8080/oauth2/${providerName}/failure"
+        service.getSuccessUrl(providerName) == "http://localhost:8080/oauth2/${providerName}/success"
+        service.getProviderService(providerName).providerConfiguration.getCallbackUrl() == "http://localhost:8080/oauth2/${providerName}/callback"
+    }
+
+
+    void "absolute URLs"() {
+        given:
+        String otherDomain = "http://other.domain"
+        grailsApplication.config."${propertyNamespace}.${providerName}.api_key" = "api_key"
+        grailsApplication.config."${propertyNamespace}.${providerName}.api_secret" = "api_secret"
+        grailsApplication.config."${propertyNamespace}.${providerName}.successUri" = "${otherDomain}/oauth2/${providerName}/success"
+        grailsApplication.config."${propertyNamespace}.${providerName}.failureUri" = "${otherDomain}/oauth2/${providerName}/failure"
+        grailsApplication.config."${propertyNamespace}.${providerName}.callback" = "${otherDomain}/oauth2/${providerName}/callback"
+        service.registerProvider(oauthProviderService)
+
+        expect:
+        service.getFailureUrl(providerName) == "${otherDomain}/oauth2/${providerName}/failure"
+        service.getSuccessUrl(providerName) == "${otherDomain}/oauth2/${providerName}/success"
+        service.getProviderService(providerName).providerConfiguration.getCallbackUrl() == "${otherDomain}/oauth2/${providerName}/callback"
+    }
+}