'Nginx causes file upload to freeze

I've been trying to figure this out for days now.

When I attempt to upload a file to my webserver written in java, about 2.5MB of the file uploads and then it just freezes. Nginx appears to be the culprit because when I upload the file to the webserver directly to the port 1234 using my vps's direct ip instead of the domain the full file uploads perfectly fine.

I am using a program also written in java to upload the file to the webserver and I am getting the error on that:

Exception in thread "main" java.io.IOException: Premature EOF
        at sun.net.www.http.ChunkedInputStream.readAheadBlocking(ChunkedInputStream.java:565)
        at sun.net.www.http.ChunkedInputStream.readAhead(ChunkedInputStream.java:609)
        at sun.net.www.http.ChunkedInputStream.read(ChunkedInputStream.java:696)
        at java.io.FilterInputStream.read(FilterInputStream.java:133)
        at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(HttpURLConnection.java:3456)
        at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(HttpURLConnection.java:3449)
        at java.nio.file.Files.copy(Files.java:2908)
        at java.nio.file.Files.copy(Files.java:3027)
        at me.hellin.Main.uploadFile(Main.java:28)
        at me.hellin.Main.main(Main.java:23)

This is my nginx config for it:

server {
    listen 80;
    server_name *redacted*;
    proxy_read_timeout 300;
    proxy_connect_timeout 300;
    proxy_send_timeout 300;

    location / {
       client_max_body_size 100M;
       proxy_pass http://localhost:1234;
    }
}

server {
    client_max_body_size 100M;
    client_body_timeout 120s;
    client_body_temp_path /tmp;
}

This is what I see in nginx error.log:

2022/05/03 14:14:41 [error] 2085134#2085134: *326930 connect() to [::1]:1234 failed (101: Network is unreachable) while connecting to upstream, client: *redacted*, server: *redacted*, request: "POST / HTTP/1.1", upstream: "http://[::1]:1234/", host: "*redacted*"

Here's my code just in case I did something wrong here that somehow only affects nginx:

private static InputStream upload(File file) throws Exception {
        HttpURLConnection httpURLConnection = (HttpURLConnection) new URL("*redacted*")
                .openConnection();

        httpURLConnection.setDoOutput(true);

        httpURLConnection.setRequestProperty("content-length", String.valueOf(file.length()));
        httpURLConnection.setRequestProperty("content-type", "application/java-archive");

        httpURLConnection.setRequestMethod("POST");

        OutputStream outputStream = httpURLConnection.getOutputStream();
        Files.copy(file.toPath(), outputStream);

        outputStream.close();

        return httpURLConnection.getInputStream();
    }

nginx

Solution 1:^[1]

I have finally found the solution to the infuriating issue. Turns out that nginx does some weird shit and I had to change the servers code (receiving the file) to send its response only after the server had closed the output stream. I was sending a response back to the client before and Ig nginx saw that and closed the connection.

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Source: Stack Overflow

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Solution 1	Hellin

'Nginx causes file upload to freeze

Solution 1:[1]

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Solution 1:^[1]