RequestCallback (Spring Framework 5.2.12.RELEASE API)

Functional Interface:
This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@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:
Since:
3.0
Author:
Arjen Poutsma
See Also:
RestTemplate.execute(java.lang.String, org.springframework.http.HttpMethod, org.springframework.web.client.RequestCallback, org.springframework.web.client.ResponseExtractor<T>, java.lang.Object...)

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`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`.

- Method Detail
  - 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.
    Parameters:
    request - the active HTTP request
    Throws:
    IOException - in case of I/O errors