MetadataUtils (grpc-all 1.66.0 API)

java.lang.Object
- io.grpc.stub.MetadataUtils

```
public final class MetadataUtils
extends Object
```
Utility functions for binding and receiving headers.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static ClientInterceptor`	`newAttachHeadersInterceptor(Metadata extraHeaders)`	Returns a client interceptor that attaches a set of headers to requests.
`static ClientInterceptor`	`newCaptureMetadataInterceptor(AtomicReference<Metadata> headersCapture, AtomicReference<Metadata> trailersCapture)`	Captures the last received metadata on a channel.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - newAttachHeadersInterceptor
```
public static ClientInterceptor newAttachHeadersInterceptor(Metadata extraHeaders)
```
    Returns a client interceptor that attaches a set of headers to requests.
    
    Parameters:
    
    extraHeaders - the headers to be passed by each call that is processed by the returned interceptor
  - newCaptureMetadataInterceptor
```
public static ClientInterceptor newCaptureMetadataInterceptor(AtomicReference<Metadata> headersCapture,
                                                              AtomicReference<Metadata> trailersCapture)
```
    Captures the last received metadata on a channel. Useful for testing.
    
    Parameters:
    
    headersCapture - to record the last received headers
    
    trailersCapture - to record the last received trailers
    
    Returns:
    
    an implementation of the channel with captures installed.