我正在尝试将我的 Angular 应用程序连接到我的新 Spring Boot 2 控制器。我启动一切，我得到：
Access to XMLHttpRequest at 'localhost:8093/restapi/setup' from origin 'http://localhost:4200' has been blocked by CORS policy: Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https.
其次是：
ERROR HttpErrorResponse {headers: HttpHeaders, status: 0, statusText: "Unknown Error", url: "localhost:8093/restapi/setup", ok: false, …}
这就是 CORS，对吗？当我击中时localhost:8093/restapi/setup正如您所期望的，我从邮递员那里得到了有效的答复。
所以我做了一些研究，特别是我发现了这一点：尝试从 REST API 获取数据时，请求的资源上不存在“Access-Control-Allow-Origin”标头 https://stackoverflow.com/questions/43871637/no-access-control-allow-origin-header-is-present-on-the-requested-resource-whe/43881141#43881141
我终于在这里找到这篇文章：
https://chariotsolutions.com/blog/post/angular-2-spring-boot-jwt-cors_part1/ https://chariotsolutions.com/blog/post/angular-2-spring-boot-jwt-cors_part1/
这导致我得到以下代码：
@Configuration
public class ManageConfiguration {
private static final Logger LOGGER = LogManager.getLogger(ManageConfiguration.class);
@Bean
public CorsFilter corsFilter() {
LOGGER.debug("Configuring CORS");
UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
CorsConfiguration config = new CorsConfiguration();
config.setAllowCredentials(true);
config.addAllowedOrigin("*");
config.addAllowedHeader("*");
config.addAllowedMethod("OPTIONS");
config.addAllowedMethod("GET");
config.addAllowedMethod("POST");
config.addAllowedMethod("PUT");
config.addAllowedMethod("DELETE");
source.registerCorsConfiguration("/**", config);
return new CorsFilter(source);
}
}
所以我认为这很简单，现在再试一次，我得到：
Access to XMLHttpRequest at 'localhost:8093/restapi/setup' from origin 'http://localhost:4200' has been blocked by CORS policy: Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https.
其次是：
ERROR HttpErrorResponse {headers: HttpHeaders, status: 0, statusText: "Unknown Error", url: "localhost:8093/restapi/setup", ok: false, …}
所以它似乎没有任何区别。
已检查，它在正确的端口上运行：
2019-02-27 14:23:21.261 INFO 9814 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8093 (http) with context path ''
确保它包含我的 CORS bean：
2019-02-27 14:23:19.608 DEBUG 9814 --- [ main] o.s.b.f.s.DefaultListableBeanFactory : Creating shared instance of singleton bean 'corsFilter'
...
o.springframework.web.filter.CorsFilter : Filter 'corsFilter' configured for use
Per 如何使用 cURL 调试 CORS 请求？ https://stackoverflow.com/questions/12173990/how-can-you-debug-a-cors-request-with-curl，我执行了以下卷曲请求来查看我的飞行前资料。
$ curl -H "Origin: http://example.com" --verbose http://localhost:8093/restapi/setup
* Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to localhost (127.0.0.1) port 8093 (#0)
> GET /restapi/setup HTTP/1.1
> Host: localhost:8093
> User-Agent: curl/7.61.0
> Accept: */*
> Origin: http://example.com
>
< HTTP/1.1 200
< Vary: Origin
< Vary: Access-Control-Request-Method
< Vary: Access-Control-Request-Headers
< Access-Control-Allow-Origin: http://example.com
< Access-Control-Allow-Credentials: true
< X-Content-Type-Options: nosniff
< X-XSS-Protection: 1; mode=block
< Cache-Control: no-cache, no-store, max-age=0, must-revalidate
< Pragma: no-cache
< Expires: 0
< X-Frame-Options: DENY
< Content-Type: application/json;charset=UTF-8
< Transfer-Encoding: chunked
< Date: Wed, 27 Feb 2019 21:38:28 GMT
<
* Connection #0 to host localhost left intact
{"issueType":["bug","epic","subTask","task","story"]}
我花了一天的时间绞尽脑汁思考下一步该尝试什么，但什么也想不出来。建议？
