diff --git a/src/SitemapParser.php b/src/SitemapParser.php
index 27ac19c3..2812a67b 100644
--- a/src/SitemapParser.php
+++ b/src/SitemapParser.php
@@ -173,8 +173,13 @@ public function getQueue() {
      * @throws WP2StaticException
      */
     public function parse( $url, $url_content = null ) {
+        $check_url = $url;
+        $clean_url = preg_replace( '/(?<!:)\/\/+/', '/', $url );
         $this->clean();
-        $this->current_url = $this->urlEncode( $url );
+        if ( $clean_url ) {
+            $check_url = $clean_url;
+        }
+        $this->current_url = $this->urlEncode( $check_url );
         if ( ! $this->urlValidate( $this->current_url ) ) {
             throw new WP2StaticException( 'Invalid URL' );
         }
@@ -242,6 +247,16 @@ protected function getContent() {
         }
     }
 
+    /**
+     * callable trim function
+     *
+     * @param string $string
+     * @return string
+     */
+    protected function trim( $string ) {
+        return trim( $string );
+    }
+
     /**
      * Search for sitemaps in the robots.txt content
      *
@@ -252,7 +267,7 @@ protected function parseRobotstxt( $robotstxt ) {
         // Split lines into array
         $lines = array_filter(
             array_map(
-                'trim',
+                [ $this, 'trim' ],
                 (array) preg_split( '/\r\n|\n|\r/', $robotstxt )
             )
         );
@@ -269,7 +284,7 @@ protected function parseRobotstxt( $robotstxt ) {
             $line = $line[0];
 
             // Split by directive and rule
-            $pair = array_map( 'trim', (array) preg_split( '/:/', $line, 2 ) );
+            $pair = array_map( [ $this, 'trim' ], (array) preg_split( '/:/', $line, 2 ) );
             // Check if the line contains a sitemap
             if (
                 strtolower( $pair[0] ) !== self::XML_TAG_SITEMAP ||
@@ -374,7 +389,12 @@ protected function parseString( $string ) {
             // Strings are not part of any documented sitemap standard
             return false;
         }
-        $array = array_filter( array_map( 'trim', (array) preg_split( '/\r\n|\n|\r/', $string ) ) );
+        $array = array_filter(
+            array_map(
+                [ $this, 'trim' ],
+                (array) preg_split( '/\r\n|\n|\r/', $string )
+            )
+        );
         foreach ( $array as $line ) {
             if ( $this->isSitemapURL( $line ) ) {
                 $this->addArray( self::XML_TAG_SITEMAP, [ 'loc' => $line ] );