Looking at the last line of your stack, the problem should be that some URLs DNS cannot be resolved In this case, you should also get an error in a single thread It’s just that the single thread runs slower and may not reach it I suggest you print the url Have a look What is the problematic URL?
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Looking at the last line of your stack, the problem should be that some URLs
DNS cannot be resolved
In this case, you should also get an error in a single thread
It’s just that the single thread runs slower and may not reach it
I suggest you print the url
Have a look What is the problematic URL?