SendGrid Retrieve Invalid Emails

The Internet has an email format, when that format is not met, or the email id doesn't exist, in that case, the mail server is not able to send the mail to the correct recipient, SendGrid provides HTTP GET method to retrieve a list of all invalid emails.

package org.wesome.sendgrid;

import com.sendgrid.SendGrid;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@RestController
public class SendGridApplication {
    @Value("${send.grid.api.key}")
    private String sendGridApiKey;

    public static void main(String[] args) {
        SpringApplication.run(SendGridApplication.class, args);
    }

    @Bean
    public SendGrid sendGrid() {
        SendGrid sendGrid = new SendGrid(sendGridApiKey);
        return sendGrid;
    }
}

package org.wesome.sendgrid.controller;

import com.sendgrid.Method;
import com.sendgrid.Request;
import com.sendgrid.Response;
import com.sendgrid.SendGrid;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.io.IOException;

@RestController
public class SendGridController {
    @Autowired
    private SendGrid sendGrid;

    @GetMapping
    public ResponseEntity sendGridAPI() throws IOException {
        Request request = new Request();
        Response response;
        try {
            request.setMethod(Method.GET);
            request.setEndpoint("suppression/invalid_emails");
            request.addQueryParam("start_time", "1");
            request.addQueryParam("limit", "1");
            request.addQueryParam("end_time", "1");
            request.addQueryParam("offset", "1");
            response = sendGrid.api(request);
            System.out.println("Headers := \n" + response.getHeaders());
            System.out.println("Body := \n" + response.getBody());
            System.out.println("StatusCode := \n" + response.getStatusCode());
        } catch (IOException ex) {
            throw ex;
        }
        return new ResponseEntity(HttpStatus.valueOf(response.getStatusCode()).getReasonPhrase(), HttpStatus.valueOf(response.getStatusCode()));
    }
}

plugins {
    id 'io.spring.dependency-management' version '1.0.11.RELEASE'
    id 'org.springframework.boot' version '2.5.5'
    id 'java'
}

group = 'org.wesome'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = JavaVersion.VERSION_1_8

repositories {
    mavenCentral()
}
dependencies {
    implementation 'com.sendgrid:sendgrid-java:4.4.5'
    implementation('org.springframework.boot:spring-boot-starter-web')
}

test {
    useJUnitPlatform()
}

send.grid.api.key=Your SendGrid Api Key

curl --location --request GET 'localhost:8080/'