AzConfig: User provided Customized Headers Policy

sdk/appconfiguration/azure-data-appconfiguration/README.md

@@ -307,6 +307,22 @@ ConfigurationSetting setting = client.setReadOnly("some_key", "some_label", fals
 
 When you interact with App Configuration using this Java client library, errors returned by the service correspond to the same HTTP status codes returned for [REST API][rest_api] requests. For example, if you try to retrieve a configuration setting that doesn't exist in your configuration store, a `404` error is returned, indicating `Not Found`.
 
+App Configuration provides a way to define customized headers through `Context` object in the public API. 
+
+```java
+ // Add your headers
+ HttpHeaders headers = new HttpHeaders();
+ headers.put("my-header1", "my-header1-value");
+ headers.put("my-header2", "my-header2-value");
+ headers.put("my-header3", "my-header3-value");
+ // Call API by passing headers in Context.
+ configurationClient.addConfigurationSettingWithResponse(
+       new ConfigurationSetting().setKey("key").setValue("value"),
+       new Context(AddHeadersFromContextPolicy.AZURE_REQUEST_HTTP_HEADERS_KEY, headers));
+ // Above three HttpHeader will be added in outgoing HttpRequest.
+```
+For more detail information, check out the [AddHeadersFromContextPolicy][add_headers_from_context_policy]
+
 ## Next steps
 
 - Samples are explained in detail [here][samples_readme].
@@ -338,5 +354,6 @@ This project has adopted the [Microsoft Open Source Code of Conduct][coc]. For m
 [source_code]: src
 [spring_quickstart]: https://docs.microsoft.com/azure/azure-app-configuration/quickstart-java-spring-app
 [performance_tuning]: https://github.com/Azure/azure-sdk-for-java/wiki/Performance-Tuning
+[add_headers_from_context_policy]: https://github.com/Azure/azure-sdk-for-java/blob/master/sdk/core/azure-core/src/main/java/com/azure/core/http/policy/AddHeadersFromContextPolicy.java
 
 ![Impressions](https://azure-sdk-impressions.azurewebsites.net/api/impressions/azure-sdk-for-java%2Fsdk%2Fappconfiguration%2Fazure-data-appconfiguration%2FREADME.png)

sdk/appconfiguration/azure-data-appconfiguration/pom.xml

@@ -36,7 +36,7 @@
     <dependency>
       <groupId>com.azure</groupId>
       <artifactId>azure-core</artifactId>
-      <version>1.1.0</version> <!-- {x-version-update;com.azure:azure-core;dependency} -->
+      <version>1.2.0-beta.1</version> <!-- {x-version-update;com.azure:azure-core;dependency} -->
     </dependency>
     <dependency>
       <groupId>org.slf4j</groupId>
@@ -46,7 +46,7 @@
     <dependency>
       <groupId>com.azure</groupId>
       <artifactId>azure-core-http-netty</artifactId>
-      <version>1.1.0</version> <!-- {x-version-update;com.azure:azure-core-http-netty;dependency} -->
+      <version>1.2.0-beta.1</version> <!-- {x-version-update;com.azure:azure-core-http-netty;dependency} -->
     </dependency>
 
     <!-- Test dependencies -->

sdk/appconfiguration/azure-data-appconfiguration/src/main/java/com/azure/data/appconfiguration/ConfigurationClientBuilder.java

@@ -10,6 +10,7 @@
 import com.azure.core.http.HttpPipeline;
 import com.azure.core.http.HttpPipelineBuilder;
 import com.azure.core.http.policy.AddDatePolicy;
+import com.azure.core.http.policy.AddHeadersFromContextPolicy;
 import com.azure.core.http.policy.AddHeadersPolicy;
 import com.azure.core.http.policy.BearerTokenAuthenticationPolicy;
 import com.azure.core.http.policy.HttpLogDetailLevel;
@@ -178,6 +179,7 @@ public ConfigurationAsyncClient buildAsyncClient() {
         policies.add(new UserAgentPolicy(httpLogOptions.getApplicationId(), clientName, clientVersion,
             buildConfiguration));
         policies.add(new RequestIdPolicy());
+        policies.add(new AddHeadersFromContextPolicy());
         policies.add(new AddHeadersPolicy(headers));
         policies.add(new AddDatePolicy());