Why am I seeing Error: 413 request entity too large in Nginx?

I have a problem when downloading large images, approximately more than 2 megabats.

POST https://apis.mysite.com/apis/auth/ads net::ERR_FAILED 413 (Payload Too Large)

I don't know what the problem is.

In the Nginx settings I specified:

client_max_body_size 100M;

worker_processes 1;

events {
worker_connections 1024;
}



http {



include mime.types;
default_type application/octet-stream;

sendfile on;
keepalive_timeout 65;


ssl_certificate ./ssl/mysite.crt;
ssl_certificate_key ./ssl/mysite.key;


client_max_body_size 100M;

upstream apispring {

server 127.0.0.1:8080;
}




server {

listen 443 ssl;
server_name apis.mysite.com;

location / {
proxy_pass http://apispring;


}

}



server {


listen 443 ssl;
server_name mysite.com www.mysite.com;

location / {
root html;
try_files $uri $uri$args $uri$args/ /index.html;
}

}



}


I also specified the Spring Boot settings

server.port = 8080

server.tomcat.threads.max = 200
server.tomcat.connection-timeout = 5s
server.tomcat.max-swallow-size = 2MB
server.tomcat.max-http-form-post-size = 50MB

server.max-http-request-header-size = 8KB

spring.servlet.multipart.max-file-size = 50MB
spring.servlet.multipart.max-request-size = 50MB


I also use Angular

previewImages: Set<string> = new Set();



submit() {



const ads: any = {
phone: '1111111111',
email: email@email.email,
}



const formData = new FormData();
formData.append('ads', JSON.stringify(ads))

let num = this.previewImages.size;
let count: number = 0

for (const [value] of this.previewImages.entries()) {
formData.append(`img${count}`, value)
count = count + 1
if (count === num) {
count = 0
}

}


this.httpRS.addAds(formData).subscribe({
next: () => {
//
}

});


}


And my Spring Boot controller class

@RestController
@RequestMapping("/apis/auth")
public class Ads {




@PostMapping(value = "/ads", produces = "application/json")
public viod addAds(@RequestParam(value = "img0", required = false) String img1,
@RequestParam(value = "img1", required = false) String img2,
@RequestParam(value = "ads") String ads) {

// body

}


}


Please tell me why this error occurs?

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