Using Apache HttpClient · Loki4j Logback

By default, Loki4j uses JavaHttpSender, backed by java.net.http.HttpClient. This sender does not require any extra dependencies. So, it should be a good fit for most users.

However, you may want to switch to ApacheHttpSender, backed by org.apache.http.client.HttpClient. In this case, you need to ensure you have added the required dependencies to your project:

Maven

Gradle

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.14</version>
</dependency>

implementation 'org.apache.httpcomponents:httpclient:4.5.14'

Then you can explicitly specify ApacheHttpSender by setting class attribute for http.sender section:

<appender name="LOKI" class="com.github.loki4j.logback.Loki4jAppender">
    <http>
        <sender class="com.github.loki4j.logback.ApacheHttpSender">
            ...
        </sender>
    </http>
    ...
</appender>

There are some specific settings available only for ApacheHttpSender that you can specify in sender section as well:

Setting	Default	Description
http.sender.maxConnections	1	Maximum number of HTTP connections to keep in the pool
http.sender.connectionKeepAliveMs	120000	A duration of time in milliseconds in which the connection can be safely kept idle for later reuse. This value should not be greater than `server.http-idle-timeout` in your Loki config