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Puppeteer adapter: "Evaluation failed: TypeError: Failed to fetch"

See original GitHub issue

I’m attempting to use Polly in an existing project to test a webform, however upon adding Polly with the Puppeteer adapter I’m running into this error from Puppeteer.

Evaluation failed: TypeError: Failed to fetch

This error isn’t present without Polly and the Puppeteer adapter.

I can provide more details upon request, but I’m unsure on what I need to share to diagnose this issue right now.

Thanks.

Issue Analytics

State:
Created 5 years ago
Comments:12

Top GitHub Comments

4reactions

scotthovestadtcommented, Apr 9, 2019

FYI this happens because of CSP errors and can be resolved with:

await page.setBypassCSP(true);

1reaction

scotthovestadtcommented, Apr 9, 2019

An easy way to reproduce it is to just open the console on github.com (this page works fine) and enter:

fetch('https://github.githubassets.com/favicon.ico')

This shows in the console as:

Evaluation failed: TypeError: Failed to fetch

      at anonymous (__puppeteer_evaluation_script__:3:8)
      at ExecutionContext.evaluateHandle (node_modules/puppeteer/lib/ExecutionContext.js:122:13)
      ...

It’s triggered by the following header:

Content-Security-Policy: default-src 'none'; base-uri 'self'; block-all-mixed-content; connect-src 'self' uploads.github.com www.githubstatus.com collector.githubapp.com api.github.com www.google-analytics.com github-cloud.s3.amazonaws.com github-production-repository-file-5c1aeb.s3.amazonaws.com github-production-upload-manifest-file-7fdce7.s3.amazonaws.com github-production-user-asset-6210df.s3.amazonaws.com wss://live.github.com; font-src github.githubassets.com; form-action 'self' github.com gist.github.com; frame-ancestors 'none'; frame-src render.githubusercontent.com; img-src 'self' data: github.githubassets.com identicons.github.com collector.githubapp.com github-cloud.s3.amazonaws.com *.githubusercontent.com; manifest-src 'self'; media-src 'none'; script-src github.githubassets.com; style-src 'unsafe-inline' github.githubassets.com

I’ll look into setting up a fail test, but regardless is probably a good idea to just recommend that the user turn this on in the documentation or even in the error message for fetch failing. I’m not seeing an easier way to work around it (unless you want to turn it on for them).

Thoughts?

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