https://github.com/spring-projects/spring-framework: Spring Web (Spring IO)
  • Juergen Hoeller 
Contains an abstraction over client-side HTTP. This package contains the ClientHttpRequest and ClientHttpResponse, as well as a basic implementation of these interfaces. 
/**
 * Contains an abstraction over client-side HTTP. This package
 * contains the {@code ClientHttpRequest} and {@code ClientHttpResponse},
 * as well as a basic implementation of these interfaces.
 */
@NonNullApi
@NonNullFields
package org.springframework.http.client;

import org.springframework.lang.NonNullApi;
import org.springframework.lang.NonNullFields;