Fix issue where resource loading was not finished before rendering di…

…rect html. More here puppeteer/puppeteer#728

README.md

@@ -111,7 +111,7 @@ is really simple, check it out. Render flow:
 3. Render url **or** html.
 
     If `url` is defined, **`page.goto(url, options)`** is called and options match `goto.*`.
-    Otherwise **`page.setContent(html)`** is called where html is taken from request body.
+    Otherwise **`page.goto(\`data:text/html,${html}\`, options)`** is called where html is taken from request body. This workaround was found from [Puppeteer issue](https://github.com/GoogleChrome/puppeteer/issues/728).
 
 4. *Possibly* **`page.waitFor(numOrStr)`** if e.g. `waitFor=1000` is set.
 5. *Possibly* **Scroll the whole page** to the end before rendering if e.g. `scrollPage=true` is set.

src/core/pdf-core.js

@@ -62,7 +62,8 @@ async function render(_opts = {}) {
 
     if (opts.html) {
       logger.info('Set HTML ..');
-      await page.setContent(opts.html);
+      // https://github.com/GoogleChrome/puppeteer/issues/728
+      await page.goto(`data:text/html,${opts.html}`, opts.goto);
     } else {
       logger.info(`Goto url ${opts.url} ..`);
       await page.goto(opts.url, opts.goto);