[BUG] "utf-8" received in header : absolute-expiry-time

[survivant]

I'm using Azure IOT explorer

here my I did :

I created a device and I changed a desired property value and click SAVE. The value was [newtest2345] and changed to [newtest23456]
in the tab Network (developer tools) I have this (I replaced some text with )

the request DataPlane:

{"apiVersion":"2020-06-30-preview","body":"{\"deviceId\":\"derniertest\",\"etag\":\"AAAAAAAAABo=\",\"deviceEtag\":\"ODQ4NDk5Mzk=\",\"status\":\"enabled\",\"statusUpdateTime\":\"2022-10-11T12:33:31.5369789Z\",\"connectionState\":\"Disconnected\",\"lastActivityTime\":\"2022-10-18T19:49:51.1552214Z\",\"cloudToDeviceMessageCount\":0,\"authenticationType\":\"sas\",\"x509Thumbprint\":{\"primaryThumbprint\":null,\"secondaryThumbprint\":null},\"modelId\":\"\",\"version\":27,\"properties\":{\"desired\":{\"test\":\"newtest23456\",\"$metadata\":{\"$lastUpdated\":\"2022-10-19T12:10:35.7728649Z\",\"$lastUpdatedVersion\":26,\"test\":{\"$lastUpdated\":\"2022-10-19T12:10:35.7728649Z\",\"$lastUpdatedVersion\":26}},\"$version\":26},\"reported\":{\"$metadata\":{\"$lastUpdated\":\"2022-09-30T19:29:03.6006968Z\"},\"$version\":1}},\"capabilities\":{\"iotEdge\":false}}","hostName":"<hidden>.azure-devices.net","httpMethod":"PATCH","path":"twins/derniertest","sharedAccessSignature":"SharedAccessSignature sr=<hidden>.azure-devices.net&sig=ZjONPDFufMG1<hidden>%3D&se=1666182004&skn=iothubowner"}

the response

{"body":{"deviceId":"derniertest","etag":"AAAAAAAAABs=","deviceEtag":"ODQ4NDk5Mzk=","status":"enabled","statusUpdateTime":"2022-10-11T12:33:31.5369789Z","connectionState":"Disconnected","lastActivityTime":"2022-10-18T19:49:51.1552214Z","cloudToDeviceMessageCount":0,"authenticationType":"sas","x509Thumbprint":{"primaryThumbprint":null,"secondaryThumbprint":null},"modelId":"","version":28,"properties":{"desired":{"test":"newtest23456","$metadata":{"$lastUpdated":"2022-10-19T12:15:03.7924736Z","$lastUpdatedVersion":27,"test":{"$lastUpdated":"2022-10-19T12:15:03.7924736Z","$lastUpdatedVersion":27}},"$version":27},"reported":{"$metadata":{"$lastUpdated":"2022-09-30T19:29:03.6006968Z"},"$version":1}},"capabilities":{"iotEdge":false}},"headers":{"content-length":"729","content-type":"application/json; charset=utf-8","vary":"Origin","server":"Microsoft-HTTPAPI/2.0","x-ms-request-id":"85863b67-69af-4742-94a7-01cb3e2b7eb5","date":"Wed, 19 Oct 2022 12:15:05 GMT","connection":"close"}}

The workflow is :

IOT Explorer -> IotHub -> routing to Eventhub endpoint -> application using Azure Java SDK.

in my listener in Java, I received these headers

{"azure_eventhubs_sequence_number":25,"operationTimestamp":"2022-10-19T12:15:03.7924736Z","content-encoding":"utf-8","correlation-id":"362f012e4089","user-id":"aW90aHViLXBvYy1zZGlvbm5l","opType":"updateTwin","azure_raw_partition_id":"2","iothub-enqueuedtime":"2022-10-19T12:15:03.802+00:00","absolute-expiry-time":"utf-8","deviceId":"derniertest","x-opt-enqueued-time":"2022-10-19T12:15:03.957Z","iothub-message-schema":"twinChangeNotification","x-opt-sequence-number":25,"iothub-connection-device-id":"derniertest","iothub-message-source":"twinChangeEvents","azure_eventhubs_enqueued_time":"2022-10-19T12:15:03.957Z","hubName":"iothub-poc-sdionne","content-type":"application/json","x-opt-offset":8589937216,"id":"ac7b5f6c-65b0-3680-1829-909206e28eec","contentType":{"type":"application","subtype":"json","parameters":{},"charset":null,"concrete":true,"wildcardType":false,"wildcardSubtype":false,"subtypeSuffix":null},"azure_eventhubs_offset":8589937216,"timestamp":1666182096792}

I don't know what should be the value, but utf-8 is certainly wrong
absolute-expiry-time":"utf-8"

here a screenshot of the data received

here my pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.7.3</version>
		<relativePath/>
	</parent>
	<groupId>com.comact</groupId>
	<artifactId>poc-iothub-to-dax</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>poc-iothub</name>
	<description>Demo project for Spring Boot</description>
	<properties>
		<java.version>11</java.version>
		<spring-cloud-azure.version>4.4.0</spring-cloud-azure.version>
        <springdoc.version>1.6.11</springdoc.version>
	</properties>
	<dependencies>
        <!-- https://mvnrepository.com/artifact/com.microsoft.azure.sdk.iot/iot-device-client -->
        <dependency>
            <groupId>com.microsoft.azure.sdk.iot</groupId>
            <artifactId>iot-device-client</artifactId>
            <version>2.1.2</version>
        </dependency>
        <dependency>
            <groupId>com.microsoft.azure.iothub-java-client</groupId>
            <artifactId>iothub-java-service-client</artifactId>
            <version>1.0.11</version>
        </dependency>
        <dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-actuator</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-webflux</artifactId>
		</dependency>
		<dependency>
			<groupId>com.azure.spring</groupId>
			<artifactId>spring-cloud-azure-starter</artifactId>
		</dependency>
		<dependency>
			<groupId>com.azure.spring</groupId>
			<artifactId>spring-cloud-azure-starter-actuator</artifactId>
		</dependency>
        <dependency>
            <groupId>com.azure.spring</groupId>
            <artifactId>spring-cloud-azure-stream-binder-eventhubs</artifactId>
            <version>4.4.0</version>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springdoc</groupId>
            <artifactId>springdoc-openapi-webflux-ui</artifactId>
            <version>${springdoc.version}</version>
        </dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>io.projectreactor</groupId>
			<artifactId>reactor-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>com.azure.spring</groupId>
				<artifactId>spring-cloud-azure-dependencies</artifactId>
				<version>${spring-cloud-azure.version}</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>

	<build>
        <finalName>poc-iothub-to-dax</finalName>
		<plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.3</version>
                    <configuration>
                        <source>${java.version}</source>
                        <target>${java.version}</target>
                    </configuration>
                </plugin>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
            <plugin>
                <groupId>org.springdoc</groupId>
                <artifactId>springdoc-openapi-maven-plugin</artifactId>
                <version>1.4</version>
            </plugin>
		</plugins>
	</build>

</project>

here the java class

package com.example.demo.consumer;

import com.example.demo.model.TestModel;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.Message;

import java.util.function.Consumer;

@Configuration
public class TwinChangeEventsConsumer {
    private static final Logger LOGGER = LoggerFactory.getLogger(TwinChangeEventsConsumer.class);

    @Autowired
    ObjectMapper objectMapper;

    @Bean
    Consumer<Message<String>> twinchangeevents() {
        return message -> {
            LOGGER.info("Consumed a twinchangeevents [{}] headers [{}]", message.getPayload(), message.getHeaders());

            try {
                String headers = objectMapper.writeValueAsString(message.getHeaders());

                TestModel model = objectMapper.readValue(headers, TestModel.class);
                model.setRaw(message.getPayload());

            } catch (JsonProcessingException e) {
                throw new RuntimeException(e);
            }

        };
    }

}