Internal server error after nginx config change

1

I have increased the buffer size from nginx configuration file (because i am getting, Request Header Or Cookie Too Large ERROR)
image

After this, getting INTERNAL SERVER ERROR

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1d101e7a6da1d24e262a4dc25fc1126da70a4aaa_2_1380x6681380×668 15 KB

2

no need to open multiple threads.

3