RequestCallback (Spring Framework 5.2.12.RELEASE API)

函数接口:
这是一个函数接口, 因此可用作 lambda 表达式或方法引用的赋值目标。
```
@FunctionalInterface
public interface RequestCallback
```
Callback interface for code that operates on a ClientHttpRequest. Allows manipulating the request headers, and write to the request body.
Used internally by the RestTemplate, but also useful for application code. There several available factory methods:
从以下版本开始:
3.0
作者:
Arjen Poutsma
另请参阅:
RestTemplate.execute(java.lang.String, org.springframework.http.HttpMethod, org.springframework.web.client.RequestCallback, org.springframework.web.client.ResponseExtractor<T>, java.lang.Object...)

方法概要

所有方法实例方法抽象方法
修饰符和类型	方法	说明
`void`	`doWithRequest(ClientHttpRequest request)`	Gets called by `RestTemplate.execute(java.lang.String, org.springframework.http.HttpMethod, org.springframework.web.client.RequestCallback, org.springframework.web.client.ResponseExtractor<T>, java.lang.Object...)` with an opened `ClientHttpRequest`.

- 方法详细资料
  - doWithRequest
```
void doWithRequest(ClientHttpRequest request)
            throws IOException
```
    Gets called by RestTemplate.execute(java.lang.String, org.springframework.http.HttpMethod, org.springframework.web.client.RequestCallback, org.springframework.web.client.ResponseExtractor<T>, java.lang.Object...) with an opened ClientHttpRequest. Does not need to care about closing the request or about handling errors: this will all be handled by the RestTemplate.
    参数:
    request - the active HTTP request
    抛出:
    IOException - in case of I/O errors