Update share_btn.py

share_btn.py

@@ -4,7 +4,7 @@ share_js = """async () => {
 		const response = await fetch(UPLOAD_URL, {
 			method: 'POST',
 			headers: {
-				'Content-Type': file.type,
+				'Content-Type': 'image/webp',
 				'X-Requested-With': 'XMLHttpRequest',
 			},
 			body: file, /// <- File inherits from Blob
@@ -48,7 +48,7 @@ share_js = """async () => {
     const urls = await Promise.all([...imgEls].map((imgEl) => {
         const origURL = imgEl.src;
         const imgId = Date.now() % 200;
-        const fileName = 'stream-multi-diffusion-' + imgId + '.png';
+        const fileName = 'stream-multi-diffusion-' + imgId + '.webp';
         return toDataURL(origURL)
             .then(dataUrl => {
                 return dataURLtoFile(dataUrl, fileName);