Using Apache HttpClient · Loki4j Logback

By default, Loki4j uses JavaHttpSender, backed by java.net.http.HttpClient available in Java 11 and later. 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 available for Java 8+ projects. 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 section:

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

ApacheHttpSender shares most of the settings with JavaHttpSender. However, there are some specific settings available only for ApacheHttpSender:

Setting	Default	Description
http.maxConnections	1	Maximum number of HTTP connections to keep in the pool
http.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