Throw error when Content-Type is omitted

Author: RobFaustLZ

package.json

@@ -1,7 +1,7 @@
 {
   "name": "labelzoom-cf-api-proxy",
   "description": "A Cloudflare Worker that serves as a reverse proxy for LabelZoom's public REST API",
-  "version": "1.2.6",
+  "version": "1.2.7",
   "private": true,
   "dependencies": {
     "hono": "4.9.12",

src/worker/index.ts

@@ -77,6 +77,12 @@ app.get("/api/v2/convert/url/to/zpl/:url{.+}", (c) => proxy(c.req.param('url')))
 //#region All other conversions
 app.use("/api/v2/convert/:sourceFormat/to/:targetFormat", (c, next) => {
     return every(
+        (c, next) => {
+            if ((c.req.header('Content-Type') ?? '') === '') {
+                throw new HTTPException(400, { message: 'Content-Type header is required' });
+            }
+            return next();
+        },
         requestId({
             headerName: 'X-LZ-Request-Id',
             generator: () => new Date().toISOString().substring(0, 19).replaceAll('-', '/').replaceAll('T', '/').replaceAll(':', '') + '--' + crypto.randomUUID(),
@@ -85,7 +91,7 @@ app.use("/api/v2/convert/:sourceFormat/to/:targetFormat", (c, next) => {
             ...c.req.param(),
             r2Bucket: c.env.LZ_R2_BUCKET,
             sampleRate: c.env.LZ_LOG_SAMPLE_RATE,
-        })
+        }),
     )(c, next);
 });
 //#endregion

src/worker/middleware/force-relative-redirects.ts

@@ -15,7 +15,7 @@ export const forceRelativeRedirects = (): MiddlewareHandler => {
                 const url = new URL(locationHeader); // throws TypeError if not a full URL
 
                 // URL parsed successfully, it's an absolute redirect rather than relative
-                if (/\.?labelzoom.net$/.test(url.host)) {
+                if (/\.?labelzoom\.net$/i.test(url.host)) {
                     c.res.headers.set('Location', url.pathname + url.search);
                 }
             } catch {