@WebFilter("/*")
public class CORSFilter implements Filter {
 
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse resp = (HttpServletResponse) servletResponse;
 
        // 告訴瀏覽器允許所有的域訪問
        // 注意 * 不能滿足帶有cookie的訪問,Origin 必須是全匹配
        // resp.addHeader("Access-Control-Allow-Origin", "*");
        // 解決辦法通過獲取Origin請求頭來動態(tài)設置
        String origin = request.getHeader("Origin");
        if (StringUtils.hasText(origin)) {
            resp.addHeader("Access-Control-Allow-Origin", origin);
        }
        // 允許帶有cookie訪問
        resp.addHeader("Access-Control-Allow-Credentials", "true");
 
        // 告訴瀏覽器允許跨域訪問的方法
        resp.addHeader("Access-Control-Allow-Methods", "*");
 
        // 告訴瀏覽器允許帶有Content-Type,header1,header2頭的請求訪問
        // resp.addHeader("Access-Control-Allow-Headers", "Content-Type,header1,header2");
        // 設置支持所有的自定義請求頭
        String headers = request.getHeader("Access-Control-Request-Headers");
        if (StringUtils.hasText(headers)) {
            resp.addHeader("Access-Control-Allow-Headers", headers);
        }
 
        // 告訴瀏覽器緩存OPTIONS預檢請求1小時,避免非簡單請求每次發(fā)送預檢請求,提升性能
        resp.addHeader("Access-Control-Max-Age", "3600");
 
        chain.doFilter(request, resp);
    }
}

@Configuration
@EnableWebMvc
public class WebConfig extends WebMvcConfigurerAdapter {
	@Override
	public void addCorsMappings(CorsRegistry registry) {
		registry.addMapping("/api/**")
			.allowedOrigins("http://domain2.com")
			.allowedMethods("PUT", "DELETE")
			.allowedHeaders("header1", "header2", "header3")
			.exposedHeaders("header1", "header2")
			.allowCredentials(false).maxAge(3600);
	}
}

location /{
?? ??? ??? ?proxy_pass http://localhost:8080/;
?? ??? ? ??
?? ??? ??? ?#告訴瀏覽器允許跨域訪問的方法
?? ??? ??? ?add_header Access-Control-Allow-Methods *;
?? ??? ??? ?# 告訴瀏覽器緩存OPTIONS預檢請求1小時
?? ??? ??? ?add_header Access-Control-Max-Age 3600;
?? ??? ??? ?#允許帶有cookie訪問
?? ??? ??? ?add_header Access-Control-Allow-Credentials true;
?? ??? ??? ?#注意 * 不能滿足帶有cookie的訪問,Origin 必須是全匹配,這里通過變量獲取
?? ??? ??? ?add_header Access-Control-Allow-Origin $http_origin;
?? ??? ??? ?#設置支持所有的自定義請求頭
?? ??? ??? ?add_header Access-Control-Allow-Headers $http_access_control_request_headers;
?? ??? ??? ?#如果預檢請求,則返回成功,不需要轉發(fā)到后端
?? ??? ??? ?if ($request_method = OPTIONS){
?? ??? ??? ??? ?return 200;
?? ??? ??? ?}
?? ??? ?}

#轉發(fā)全部以/api開頭的請求到web服務器
???location??/api
???{
? ? ? ? proxy_pass?http://127.0.0.1:8080/api;
???}