diff --git a/README b/README
index b376176..742b8df 100644
--- a/README
+++ b/README
@@ -3,16 +3,16 @@ HTTP Custom Internationalized Status Messages
 About
 ------------------------------------------------------------------------------
 Apache HTTP server allows custom error messages through the ErrorDocument
-directive (see http://httpd.apache.org/docs/2.4/mod/core.html#errordocument ),
+directive (see https://httpd.apache.org/docs/2.4/mod/core.html#errordocument ),
 which also could be internationalized using content negotiation (see
-http://httpd.apache.org/docs/2.4/content-negotiation.html ). For such pages
+https://httpd.apache.org/docs/2.4/content-negotiation.html ). For such pages
 no advanced CGI is necessary, so using Server Side Includes (see
-http://httpd.apache.org/docs/2.4/howto/ssi.html ) provided by mod_include
-(see http://httpd.apache.org/docs/2.4/mod/mod_include.html ) one could
+https://httpd.apache.org/docs/2.4/howto/ssi.html ) provided by mod_include
+(see https://httpd.apache.org/docs/2.4/mod/mod_include.html ) one could
 achieve "homogenous and consistent style and layout" with minimum maintenance
 work. This project is based on the ideas and examples from the page Using XSSI
 and ErrorDocument to configure customized international server error responses
-(see http://httpd.apache.org/docs/1.3/misc/custom_errordocs.html ) from HTTPD
+(see https://httpd.apache.org/docs/1.3/misc/custom_errordocs.html ) from HTTPD
 1.3's documentation.
 
 Installation
@@ -20,7 +20,7 @@ Installation
 These are the steps to follow to install and configure custom error docs:
 
 1. Create directory for the error documents (see
-http://httpd.apache.org/docs/1.3/misc/custom_errordocs.html#createdir ) and
+https://httpd.apache.org/docs/1.3/misc/custom_errordocs.html#createdir ) and
 modify your HTTPD configuration as described.
 2. Download projects files into the directory created in point 1.
 3. Restart HTTPD.
diff --git a/footer.bg.shtml b/footer.bg.shtml
index df5f60d..7298c60 100644
--- a/footer.bg.shtml
+++ b/footer.bg.shtml
@@ -14,7 +14,7 @@
 <hr />
 
 <p>
-  <a href="http://www.apache.org">
+  <a href="https://www.apache.org/">
     <img alt="Powered by <!--#echo var="SERVER_SOFTWARE" -->"
          src="<!--#echo var="Apache_Banner" -->"
          title="Powered by <!--#echo var="SERVER_SOFTWARE"-->" />
@@ -25,17 +25,17 @@
 
 <p>
 <!-- Valid XHTML 1.0 -->
-<a href="http://validator.w3.org/check?uri=referer" hreflang="en">
+<a href="https://validator.w3.org/check?uri=referer" hreflang="en">
 <img alt="[Икона Валиден XHTML 1.0]" height="31" src="/img/valid-xhtml" title="Валиден XHTML 1.0!" width="88" /></a>&nbsp;
 <!-- Valid CSS -->
-<a href="http://jigsaw.w3.org/css-validator" hreflang="en">
+<a href="https://jigsaw.w3.org/check/referer" hreflang="en">
 <img alt="[Икона Валиден CSS]" height="31" src="/img/valid-css" title="Валиден CSS!" width="88" /></a>&nbsp;
 <!-- WAI WCAG Conformance -->
-<a href="http://www.w3.org/WAI/WCAG1AA-Conformance" hreflang="en">
+<a href="https://www.w3.org/WAI/WCAG1AA-Conformance" hreflang="en">
 <img alt="[Икона за съответствие с ниво двойно А, W3C-WAI Web Content Accessibility Guidelines 1.0]"
 height="31" src="/img/wai-wcag-1.0-2a" title="Обяснение на съотвестстие със ниво двойно А" width="88" /></a>&nbsp;
 <!-- UTF-8 Encoded -->
-<a href="http://www.unicode.org" hreflang="en">
+<a href="https://www.unicode.org/" hreflang="en">
 <img alt="[Икона Кодирано в UTF-8]" height="31" src="/img/unicode" title="Кодирано в UTF-8!" width="88" /></a>
 </p>
 
diff --git a/footer.en.shtml b/footer.en.shtml
index f8195d8..79c1c79 100644
--- a/footer.en.shtml
+++ b/footer.en.shtml
@@ -14,7 +14,7 @@ please inform <a href="mailto:<!--#echo encoding="url" var="MailTo"
 <hr />
 
 <p>
-  <a href="http://www.apache.org">
+  <a href="https://www.apache.org/">
     <img alt="Powered by <!--#echo var="SERVER_SOFTWARE" -->"
          src="<!--#echo var="Apache_Banner" -->"
          title="Powered by <!--#echo var="SERVER_SOFTWARE"-->" />
@@ -25,17 +25,17 @@ please inform <a href="mailto:<!--#echo encoding="url" var="MailTo"
 
 <p>
 <!-- Valid XHTML 1.0 -->
-<a href="http://validator.w3.org/check?uri=referer" hreflang="en">
+<a href="https://validator.w3.org/check?uri=referer" hreflang="en">
 <img alt="[Valid XHTML 1.0 icon]" height="31" src="/img/valid-xhtml" title="Valid XHTML 1.0!" width="88" /></a>&nbsp;
 <!-- Valid CSS -->
-<a href="http://jigsaw.w3.org/css-validator" hreflang="en">
+<a href="https://jigsaw.w3.org/check/referer" hreflang="en">
 <img alt="[Valid CSS icon]" height="31" src="/img/valid-css" title="Valid CSS!" width="88" /></a>&nbsp;
 <!-- WAI WCAG Conformance -->
-<a href="http://www.w3.org/WAI/WCAG1AA-Conformance">
+<a href="https://www.w3.org/WAI/WCAG1AA-Conformance">
 <img alt="[Level Double-A conformance icon, W3C-WAI Web Content Accessibility Guidelines 1.0]"
 height="31" src="/img/wai-wcag-1.0-2a" title="Explanation of Level Double-A Conformance" width="88" /></a>&nbsp;
 <!-- UTF-8 Encoded -->
-<a href="http://www.unicode.org" hreflang="en">
+<a href="https://www.unicode.org/" hreflang="en">
 <img alt="[Encoded in UTF-8 icon]" height="31" src="/img/unicode" title="Encoded in UTF-8!" width="88" /></a>
 </p>
 
diff --git a/search.bg.shtml b/search.bg.shtml
index 306c1a9..887a82c 100644
--- a/search.bg.shtml
+++ b/search.bg.shtml
@@ -2,16 +2,16 @@
 <p>Ако желаете можете да потърсите ресурса директно от тук.</p>
 <!-- Google Search -->
 <div id="GoogleLogo">
-<a href="http://www.google.com/search" hreflang="en">
+<a href="https://www.google.com/search" hreflang="en">
 <img alt="[Лого на Google Търсене]" height="53" src="/img/google_logo"
 width="128" title="Google Търсене" /></a>
 </div>
 
-<form action="http://www.google.com/custom" id="GoogleSearch" method="get">
+<form action="https://www.google.com/custom" id="GoogleSearch" method="get">
 <p><input name="ie" type="hidden" value="UTF-8" />
 <input name="oe" type="hidden" value="UTF-8" />
 <input name="safe" type="hidden" value="vss" />
-<input name="cof" type="hidden" value="S:http://<!--#echo var="SERVER_NAME" -->;AWFID:262c29acacd332f0;" />
+<input name="cof" type="hidden" value="S:https://<!--#echo var="SERVER_NAME" -->;AWFID:262c29acacd332f0;" />
 <input name="domains" type="hidden" value="<!--#echo var="SERVER_NAME" -->" />
 <input name="q" maxlength="255" size="40" type="text" value="" />
 <input name="sa" type="submit" value="Google Търсене" /><br />
diff --git a/search.en.shtml b/search.en.shtml
index b341942..a05fae8 100644
--- a/search.en.shtml
+++ b/search.en.shtml
@@ -2,16 +2,16 @@
 <p>If you want you can search for the resource directly from here.</p>
 <!-- Google Search -->
 <div id="GoogleLogo">
-<a href="http://www.google.com/search" hreflang="en">
+<a href="https://www.google.com/search" hreflang="en">
 <img alt="[Google Search Logo]" height="53" src="/img/google_logo"
 width="128" title="Google Search" /></a>
 </div>
 
-<form action="http://www.google.com/custom" id="GoogleSearch" method="get">
+<form action="https://www.google.com/custom" id="GoogleSearch" method="get">
 <p><input name="ie" type="hidden" value="UTF-8" />
 <input name="oe" type="hidden" value="UTF-8" />
 <input name="safe" type="hidden" value="vss" />
-<input name="cof" type="hidden" value="S:http://<!--#echo var="SERVER_NAME" -->;AWFID:262c29acacd332f0" />
+<input name="cof" type="hidden" value="S:https://<!--#echo var="SERVER_NAME" -->;AWFID:262c29acacd332f0" />
 <input name="domains" type="hidden" value="<!--#echo var="SERVER_NAME" -->" />
 <input name="q" maxlength="255" size="40" type="text" value="" />
 <input name="sa" type="submit" value="Google Search" /><br />