diff --git a/src/ImageData/CartaFitsImage.cc b/src/ImageData/CartaFitsImage.cc
index 9f063e9be..bb059d2e7 100644
--- a/src/ImageData/CartaFitsImage.cc
+++ b/src/ImageData/CartaFitsImage.cc
@@ -240,6 +240,7 @@ fitsfile* CartaFitsImage::OpenFile() {
         fits_open_file(&fptr, _filename.c_str(), iomode, &status);
 
         if (status) {
+            fits_report_error(stdout, status);
             char err_text[30];
             fits_get_errstatus(status, err_text);
             std::string error(err_text);
diff --git a/src/Util/File.cc b/src/Util/File.cc
index 47ffc7833..c4388535a 100644
--- a/src/Util/File.cc
+++ b/src/Util/File.cc
@@ -8,6 +8,7 @@
 
 #include <spdlog/fmt/fmt.h>
 #include <fstream>
+#include <regex>
 
 #include "String.h"
 
@@ -35,7 +36,8 @@ bool IsCompressedFits(const std::string& filename) {
 }
 
 bool IsRemoteHttpFile(const std::string& filename) {
-    return filename.find("http") == 0;
+    const std::regex is_http_url("^https?://");
+    return std::regex_search(filename, is_http_url);
 }
 
 bool IsGzMagicNumber(uint32_t magic_number) {