Fixes issue with Calibre web expecting SSL (#347)

http urls now work with Calibre web

---------

Co-authored-by: Dave Allie <dave@daveallie.com>

src/util/UrlUtils.cpp

@@ -2,6 +2,8 @@
 
 namespace UrlUtils {
 
+bool isHttpsUrl(const std::string& url) { return url.rfind("https://", 0) == 0; }
+
 std::string ensureProtocol(const std::string& url) {
   if (url.find("://") == std::string::npos) {
     return "http://" + url;

src/util/UrlUtils.h

@@ -3,6 +3,11 @@
 
 namespace UrlUtils {
 
+/**
+ * Check if URL uses HTTPS protocol
+ */
+bool isHttpsUrl(const std::string& url);
+
 /**
  * Prepend http:// if no protocol specified (server will redirect to https if needed)
  */