1GB File Upload Failure - 502 Bad Gateway

Hi @Everyone, My MERN stack doesn’t allow clients to upload more than 1GB files, while 800MB, 300M ,and 50MB file uploads worked correctly.

After uploading progress reaches100%, it immediately retrieves 502 Bad Gateway responses.

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Here is the server log:

2022/03/03 14:54:15 [error] 2614707#2614707: *7 upstream prematurely closed connection while reading response header from upstream, client: 80.237.47.16, server: xxx.com, request: “POST /api/modules/uploadFile HTTP/1.1”, upstream: “http://127.0.0.1:5000/api/modules/uploadFile”, host: “www.xxx.com”, referrer: “https://www.xxx.com/modules/edit/621fb81865634689d4c68141”

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/etc/nginx/sites-available/default

    proxy_max_temp_file_size 0;
    proxy_connect_timeout 1800s;
    proxy_send_timeout 1800s;
    proxy_read_timeout 1800s;
    proxy_buffer_size 128k;
    proxy_buffers 128 256k;
    proxy_busy_buffers_size 256k;
    proxy_redirect off;
    proxy_request_buffering off;
    proxy_buffering off;

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/etc/nginx/nginx.conf

http {

    ##
    # Basic Settings
    ##

    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 1800;
    types_hash_max_size 2048;
    client_max_body_size 4096M;
    fastcgi_read_timeout 1800s;
    client_body_timeout 1800s;
    client_header_timeout 1800s;
    # server_tokens off;

    ...

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Could anyone recommend any solutions,please? Thank you