[BUG] Firefox DevTools does not decode Playwright's HAR response bodies of text resources #11532

DetachHead · 2022-01-21T01:15:15Z

Context:

System:

OS: Windows 10 10.0.18363
Memory: 2.46 GB / 15.78 GB

Binaries:

Node: 16.9.1 - C:\Program Files\nodejs\node.EXE
npm: 7.24.1 - C:\Program Files\nodejs\npm.CMD

Languages:

Bash: 5.0.17 - C:\WINDOWS\system32\bash.EXE

npmPackages:

playwright: ^1.18.0 => 1.18.0

Code Snippet

const context = await browser.newContext({ recordHar: { path: 'asdf.har' } })
const page = await context.newPage()
await page.goto('https://google.com/')
await context.close()

Describe the bug

har file exported by playwright:

har file exported manually:

mxschmitt · 2022-01-21T10:37:50Z

This works when you load the HAR file into Chromium and does not work in Firefox. Seems like Firefox does not decode the text resources, even tho we say its base64. The spec does not give any advice when to use base64 and when not, so we use it all the time.

Seems like it needs to be fixed on their (Firefox DevTools) side. Some code pointers:

DetachHead · 2022-01-23T23:56:16Z

the reason i used firefox for those screenshots was because in chrome the base64 responses were not being displayed at all, which i assume is somehow related.

when exported from playwright:

when exported manually:

but now that i try this on the google.com example i can't seem to reproduce it, only on the application i'm testing. it only seems to happen with sap batch requests

mxschmitt changed the title ~~[BUG] http responses in har files are base64 encoded~~ [BUG] Firefox DevTools does not decode Playwright's HAR response bodies of text resources Jan 21, 2022

mxschmitt added P3-collecting-feedback good first issue labels Jan 21, 2022

microsoft / playwright Public

[BUG] Firefox DevTools does not decode Playwright's HAR response bodies of text resources #11532

[BUG] Firefox DevTools does not decode Playwright's HAR response bodies of text resources #11532

DetachHead commented Jan 21, 2022 •

edited

mxschmitt commented Jan 21, 2022 •

edited

DetachHead commented Jan 23, 2022

microsoft / playwright Public

[BUG] Firefox DevTools does not decode Playwright's HAR response bodies of text resources #11532

[BUG] Firefox DevTools does not decode Playwright's HAR response bodies of text resources #11532

Comments

DetachHead commented Jan 21, 2022 • edited

System:

Binaries:

Languages:

npmPackages:

mxschmitt commented Jan 21, 2022 • edited

DetachHead commented Jan 23, 2022

DetachHead commented Jan 21, 2022 •

edited

mxschmitt commented Jan 21, 2022 •

edited