diff --git a/examples/leaflet.html b/examples/leaflet.html
index a5033c9..74e4e74 100644
--- a/examples/leaflet.html
+++ b/examples/leaflet.html
@@ -18,7 +18,7 @@
        <div id="map"></div> 
        <script>
         const map = L.map('map',{maxZoom:4}).setView([0,0],0)
-        const p = new pmtiles.PMTiles('osm_carto.pmtiles')
+        const p = new pmtiles.PMTiles('osm_carto.pmtiles',{allow_200:true})
         p.leafletLayer({attribution:'© <a href="https://openstreetmap.org">OpenStreetMap</a> contributors'}).addTo(map)
        </script>
     </body>
diff --git a/js/pmtiles.js b/js/pmtiles.js
index b775925..2c5bc83 100644
--- a/js/pmtiles.js
+++ b/js/pmtiles.js
@@ -40,10 +40,11 @@
     }
 
     class PMTiles {
-        constructor(url) {
+        constructor(url, options) {
             this.url = url
             this.root = fetch(this.url,{method:'HEAD',headers:{Range:'bytes=0-511999'}}).then(resp => {
-                if (resp.status == 206) { // this does not work on Azure, it returns 200 instead of 206
+                 // for servers like Azure, GH Pages which return 200 instead of 206
+                if (resp.status == 206 || (resp.status == 200 && options.allow_200)) {
                     console.log("Check succeeded: server supports byte ranges")
                     return fetch(this.url,{headers:{Range:'bytes=0-511999'}}).then(resp => {
                         return resp.arrayBuffer()