Add doctype/lang and harden JSON response parsing

build.sh

@@ -1,7 +1,7 @@
 #!/bin/sh
 set -eu
 
-VERSION=1.1.0
+VERSION=1.1.1
 GIT_SHA=$(git rev-parse --short HEAD)
 IMAGE="docker.sdal.tech/beam:$VERSION-$GIT_SHA"
 IMAGE_LATEST="docker.sdal.tech/beam:latest"

index.html.tmpl

@@ -1,4 +1,5 @@
-<html>
+<!DOCTYPE html>
+<html lang="en">
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
@@ -247,8 +248,12 @@
 
             xhr.addEventListener('load', () => {
                 if (xhr.status === 200) {
-                    const response = JSON.parse(xhr.responseText);
-                    displayResults(response.urls);
+                    try {
+                        const response = JSON.parse(xhr.responseText);
+                        displayResults(response.urls);
+                    } catch (e) {
+                        showMessage('Upload failed: Unexpected response from server');
+                    }
                 } else {
                     let message = xhr.statusText;
                     try {