HttpClientHandler (Spring Cloud Sleuth API 3.1.10 API)

```
public interface HttpClientHandler
```
This API is taken from OpenZipkin Brave. This standardizes a way to instrument http clients, particularly in a way that encourages use of portable customizations via HttpRequestParser and HttpResponseParser.

Since:

3.0.0

Author:

OpenZipkin Brave Authors, Marcin Grzejszczak

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`handleReceive(HttpClientResponse response, Span span)`	Finishes the client span after assigning it tags according to the response or error.
`Span`	`handleSend(HttpClientRequest request)`	Starts the client span after assigning it a name and tags.
`Span`	`handleSend(HttpClientRequest request, TraceContext parent)`	Same as `handleSend(HttpClientRequest)` but with an explicit parent `TraceContext`.

- Method Detail
  - handleSend
```
Span handleSend(HttpClientRequest request)
```
    Starts the client span after assigning it a name and tags. This injects the trace context onto the request before returning. Call this before sending the request on the wire.
    
    Parameters:
    
    request - to inject the tracing context with
    
    Returns:
    
    client side span
  - handleSend
```
Span handleSend(HttpClientRequest request,
                @Nullable
                TraceContext parent)
```
    Same as handleSend(HttpClientRequest) but with an explicit parent TraceContext.
    
    Parameters:
    
    request - to inject the tracing context with
    
    parent - TraceContext that is to be the client side span's parent
    
    Returns:
    
    client side span
  - handleReceive
```
void handleReceive(HttpClientResponse response,
                   Span span)
```
    Finishes the client span after assigning it tags according to the response or error.
    
    Parameters:
    
    response - the HTTP response
    
    span - span to be ended