adding explicit check for ending slash on endpoint.

owa-plugin.php

@@ -986,9 +986,10 @@ public function registerOptions() {
 					'title'									=> 'OWA Endpoint',
 					'page_name'								=> 'owa-wordpress',
 					'section'								=> 'general',
-					'description'							=> 'The URL of your OWA instance (i.e. http://www.mydomain.com/path/to/owa/). This should be the same as the OWA_PUBLIC_URL of your OWA server instance as defined in its owa-config.php file.',
+					'description'							=> 'The URL of your OWA instance (i.e. http://www.mydomain.com/path/to/owa/). This should be the same as the OWA_PUBLIC_URL of your OWA server instance as defined in its owa-config.php file and MUST end with a "/".',
 					'label_for'								=> 'OWA Endpoint',
 					'length'								=> 70,
+					'endWithSlash'							=> true,
 					'error_message'							=> ''		
 				)				
 			),

src/settings/fields/url.php

@@ -51,6 +51,21 @@ public function isValid( $value ) {
 
 			return false;
 		}
+
+		// check to ensure the URL ends with a slash.
+
+		if ( $this->get( 'endWithSlash' ) && substr( $value, -1, 1 ) != "/" ) {
+
+			$this->addError( 
+			$this->get('dom_id'), 
+			sprintf(
+				'%s %s',
+				$this->get( 'label_for' ),
+				\owaWp\util::localize( 'URL must end with a slash. (i.e. http://mydomain.com/owa/ )' ) ) );
+
+			return false;
+		}
+
 
 		if ( filter_var( $value, FILTER_VALIDATE_URL ) ) {