_parseFetchBody get body.text() never returns when fetch is a flv live stream

[yjhtry]

Is there an existing issue for this?

• I have checked for existing issues https://github.com/getsentry/sentry-javascript/issues
• I have reviewed the documentation https://docs.sentry.io/
• I am using the latest SDK release https://github.com/getsentry/sentry-javascript/releases

How do you use Sentry?

Self-hosted/on-premise

Which SDK are you using?

@sentry/nextjs

SDK Version

7.75.1

Framework Version

13.4.19

Link to Sentry event

No response

SDK Setup

No response

Steps to Reproduce

In my web application, I implement video live streaming by fetching flv files. During the test, the space of the page process will grow rapidly as the live broadcast progresses. When I checked the source code, I found that the _parseFetchBody method will obtain the text returned by the flv file. Get responseBodySize through it, but this is an operation that will not end(At least until the live broadcast ends)

_parseFetchBody

What's worse is that due to response.clone(), when flv fetch changes or is re-fetched, _parseFetchBody will cause more and more fechts to be processed in the network

2023-11-21.17.16.53.mov

Expected Result

I can ignore the target fetch through parameter settings, or increase the timeout of _parseFetchBody, or all your good ideas

Actual Result

2023-11-21.17.37.12.mov

At this speed, the webpage will crash in about an hour or so 😂

[mydea]

hey, thanks for writing in! That makes a lot of sense, we didn't think of this (TBH I didn't know that fetch could stream like that 😅 )

I wonder, how does such a streaming fetch call look like? I guess we need to identify that a fetch call is streaming and skip this check 🤔 Could you share the code you use to make this fetch call?

[yjhtry]

@mydea Sorry, because this is an internal company project, I do not have the conditions to reproduce it using codesandbox for the time being.
If it is convenient for you, you can use this library and use sentry/nextjs at the same time

[yjhtry]

flv.js code using streaming

[mydea]

Thanks for the pointers!

Looking through this, it seems this is hard to figure out 🤔 do you by chance know which headers are sent for these requests? Maybe we can filter these out specifically.

Other than this, I'll add a general timeout when trying to read the body, so we just abort after e.g. 500ms. Not a real "fix" but better than nothing!