使用feign服务调用添加Header参数

使用feign服务调用添加Header参数

feign添加Header参数

@Configuration

public class FeignConfiguration implements RequestInterceptor {

private static final Logger logger = LoggerFactory.getLogger(FeignConfiguration.class);

@Override

public void apply(RequestTemplate template) {

ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();

if(null != attributes) {

HttpServletRequest request = attributes.getRequest();

String token = request.getHeader("token");

template.header("token", token);

}

logger.info("feign interceptor header:{}",template);

}

}

Feign设置Header头部,@Headers无效

在使用FeignClient调用外部接口的时候，需要在请求头部添加header的参数，用于请求的认证。在查找Feign文档中提供了@Headers注解，该注解可以完成头部的添加。但是却没有生效

@FeignClient(name="name",url = "127.0.0.1:8090/test",path = "/")

public interface IUserService {

@RequestMapping(value = "getUserPage",method = RequestMethod.POST)

@Headers(value={"ContentType=application/x-www-form-urlencoded","Inner_token=PXH0dP5I8qQ8UbFPpzm67cQkm7j8tWT2Kwn6J6SXYkfp2kMo/lSqHQ=="})

public Map getUserPage(User user);

}

在服务端获取不到Inner_token的头部参数。得到的结果是null

于是开启feign的日志

第一步：定义feign的日志配置文件类

@Configuration

public class FeignConfig {

@Bean

Logger.Level feignLevel(){

return Logger.Level.FULL;

}

}

第二步：在调用的FeignClien客户端注解上指定该日志级别配置文件

@FeignClient(name="name",url = "127.0.0.1:8090/test",path = "/",configuration = FeignConfig.class)

public interface IUserService {

@http://RequestMapping(value = "getUserPage",method = RequestMethod.POST)

@Headers(value={"ContentType=application/x-www-form-urlencoded","Inner_token=PXH0dP5I8qQ8UbFPpzm67cQkm7j8tWT2Kwn6J6SXYkfp2kMo/lSqHQ=="})

public Map getUserPage(User user);

}

第三步：配置yml文件，指定该feignclient的配置路径和日志级别

logging:

level:

demo.IUserService: debug

重启，并发起请求

2019-09-27 10:46:01.662 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] ---> POST http://127.0.0.1:8090/test/getUserPage HTTP/1.1

2019-09-27 10:46:01.663 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] Content-Type: application/json;charset=UTF-8

2019-09-27 10:46:01.663 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] Content-Length: 53

2019-09-27 10:46:01.663 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage]

2019-09-27 10:46:01.663 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] {"id":0,"tableName":"feignTable","page":10,"size":10}

2019-09-27 10:46:01.663 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] ---> END HTTP (53-byte body)

2019-09-27 10:46:01.684 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] <--- HTTP/1.1 200 (21ms)

2019-09-27 10:46:01.684 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] content-type: application/json;charset=UTF-8

2019-09-27 10:46:01.685 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] date: Fri, 27 Sep 2019 02:46:01 GMT

2019-09-27 10:46:01.685 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] transfer-encoding: chunked

2019-09-27 10:46:01.685 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] x-application-context: HelloServer:8090

2019-09-27 10:46:01.685 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage]

2019-09-27 10:46:01.689 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] {"success":true,"rows":[{"id":10111,"tableName":"hbaseTable","page":1,"size":20},{"id":10112,"tableName":"hbaseTable","page":1,"sizhttp://e":20},{"id":10113,"tableName":"hbaseTable","page":1,"size":20},{"id":10114,"tableName":"hbaseTable","page":1,"size":20},{"id":10115,"tableName":"hbaseTable","page":1,"size":20},{"id":10116,"tableName":"hbaseTable","page":1,"size":20},{"id":10117,"tableName":"hbaseTable","page":1,"size":20},{"id":10118,"tableName":"hbaseTable","page":1,"size":20},{"id":10119,"tableName":"hbaseTable","page":1,"size":20},{"id":10120,"tableName":"hbaseTable","page":1,"size":20}]}

2019-09-27 10:46:01.689 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] <--- END HTTP (595-byte body)

在日志中发现，header中没有被加上我之前设置的参数。说明该注解没有生效

于是debug调试

通过debug我发现feign会先将请求参数构建成Request对象，request信息如下：

从图中可看到，该Request实例的headers属性为空，而Request又是根据RequestTemplate模板对象生成的，RequestTemplate实例信息如下：

到这里可以看出，问题是出在RequestTemplate的构建构成中，于是我就去跟踪RequestTemplate构建的代码，发现RequestTemplate是根据MethodMetadata构建而成，而MethodMetadata就是对方法配置的抽象。

RequestTemplate template = resolve(argv, mutable, varhttp://Builder);

if (metadata.queryMapIndex() != null) {

// add query map parameters after initial resolve so that they take

// precedence over any predefined values

template = addQueryMapQueryParameters(argv, template);

}

if (metadata.headerMapIndex() != null) {

template = addHeaderMapHeaders(argv, template);

}

从上述代码可以看到，header的设置是由metadata的headerMapIndex 属性决定的，那么，设置headerMapIndex的位置，必然就和Header的解析相关，于是通过查看方法引用，我找到了下面的代码：

private void parseHeaders(MethodMetadata md, Method method,

RequestMapping annotation) {

// TODO: only supports one header value per key

if (annotation.headers() != null && annotation.headers().length > 0) {

for (String header : annotation.headers()) {

int index = header.indexOf('=');

if (!header.contains("!=") && index >= 0) {

md.template().header(resolve(header.substring(0, index)),

resolve(header.substring(index + 1).trim()));

}

}

}

}

从代码中我们可以清晰的看到，解析过程中是从@RequestMapping或其派生注解的header属性中解析Header的，并且Header的key和value需要用“=”进行分割。

于是我修改成下面的形式，问题就解决了：

@FeignClient(name="name",url = "127.0.0.1:8090/test",path = "/",configuration = FeignConfig.class)

public interface IUserService {

@RequestMapping(value = "getUserPage",method = RequestMethod.POST,headers = {"ContentType=application/x-www-form-urlencoded","Inner_token=PXH0dP5I8qQ8UbFPpzm67cQkm7j8tWT2Kwn6J6SXYkfp2kMo/lSqHQ=="})

@Headers(value={"ContentType=application/x-www-form-urlencoded","Inner_token=PXH0dP5I8qQ8UbFPpzm67cQkm7j8tWT2Kwn6J6SXYkfp2kMo/lSqHQ=="})

public Map getUserPage(User user);

}

查看请求日志

2019-09-27 11:10:29.975 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] ---> POST http://127.0.0.1:8090/test/getUserPage HTTP/1.1

2019-09-27 11:10:29.976 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] ContentType: application/x-www-form-urlencoded

2019-09-27 11:10:29.976 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] Inner_token: PXH0dP5I8qQ8UbFPpzm67cQkm7j8tWT2Kwn6J6SXYkfp2kMo/lSqHQ==

2019-09-27 11:10:29.976 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] Content-Type: application/json;charset=UTF-8

2019-09-27 11:10:29.976 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] Content-Length: 53

2019-09-27 11:10:29.976 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage]

2019-09-27 11:10:29.976 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] {"id":0,"tableName":"feignTable","page":10,"size":10}

2019-09-27 11:10:29.976 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] ---> END HTTP (53-byte body)

2019-09-27 11:10:29.992 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] <--- HTTP/1.1 200 (16ms)

2019-09-27 11:10:29.993 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] content-type: application/json;charset=UTF-8

2019-09-27 11:10:29.993 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] date: Fri, 27 Sep 2019 03:10:29 GMT

2019-09-27 11:10:29.993 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] transfer-encoding: chunked

2019-09-27 11:10:29.993 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] x-application-context: HelloServer:8090

2019-09-27 11:10:29.993 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage]

2019-09-27 11:10:29.995 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] {"success":true,"rows":[{"id":10141,"tableName":"hbaseTable","page":1,"size":20},{"id":10142,"tableName":"hbaseTable","page":1,"size":20},{"id":10143,"tableName":"hbaseTable","page":1,"size":20},{"id":10144,"tableName":"hbaseTable","page":1,"size":20},{"id":10145,"tableName":"hbaseTable","page":1,"size":20},{"id":10146,"tableName":"hbaseTable","page":1,"size":20},{"id":10147,"tableName":"hbaseTable","page":1,"size":20},{"id":10148,"tableName":"hbaseTable","page":1,"size":20},{"id":10149,"tableName":"hbaseTable","page":1,"size":20},{"id":10150,"tableName":"hbaseTable","page":1,"size":20}]}

2019-09-27 11:10:29.995 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] <--- END HTTP (595-byte body)

请求中header已经被成功添加~

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