diff --git a/Makefile b/Makefile
index 63972623..814e4ad4 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-VERSION=1.8.7
+VERSION=1.8.8
 
 default: compile
 
@@ -63,4 +63,4 @@ refresh:
 	./gradlew --refresh-dependencies
 
 upgrade-wrapper:
-	./gradlew wrapper --gradle-version=6.7.1 --distribution-type=bin
\ No newline at end of file
+	./gradlew wrapper --gradle-version=6.8.1 --distribution-type=bin
\ No newline at end of file
diff --git a/README.md b/README.md
index e73fe24d..2a99b473 100644
--- a/README.md
+++ b/README.md
@@ -100,8 +100,8 @@ scrape_configs:
 
 The docker images are available via:
 ```bash
-docker pull pambrose/prometheus-proxy:1.8.7
-docker pull pambrose/prometheus-agent:1.8.7
+docker pull pambrose/prometheus-proxy:1.8.8
+docker pull pambrose/prometheus-agent:1.8.8
 ```
 
 Start a proxy container with:
@@ -110,7 +110,7 @@ Start a proxy container with:
 docker run --rm -p 8082:8082 -p 8092:8092 -p 50051:50051 -p 8080:8080 \
         --env ADMIN_ENABLED=true \
         --env METRICS_ENABLED=true \
-        pambrose/prometheus-proxy:1.8.7
+        pambrose/prometheus-proxy:1.8.8
 ```
 
 Start an agent container with:
@@ -118,7 +118,7 @@ Start an agent container with:
 ```bash
 docker run --rm -p 8083:8083 -p 8093:8093 \
         --env AGENT_CONFIG='https://raw.githubusercontent.com/pambrose/prometheus-proxy/master/examples/simple.conf' \
-        pambrose/prometheus-agent:1.8.7
+        pambrose/prometheus-agent:1.8.8
 ```
 
 Using the config file [simple.conf](https://raw.githubusercontent.com/pambrose/prometheus-proxy/master/examples/simple.conf),
@@ -134,7 +134,7 @@ is in your current directory, run an agent container with:
 docker run --rm -p 8083:8083 -p 8093:8093 \
     --mount type=bind,source="$(pwd)"/prom-agent.conf,target=/app/prom-agent.conf \
     --env AGENT_CONFIG=prom-agent.conf \
-    pambrose/prometheus-agent:1.8.7
+    pambrose/prometheus-agent:1.8.8
 ```
 
 **Note:** The `WORKDIR` of the proxy and agent images is `/app`, so make sure 
@@ -255,7 +255,7 @@ docker run --rm -p 8082:8082 -p 8092:8092 -p 50440:50440 -p 8080:8080 \
     --env PROXY_CONFIG=tls-no-mutual-auth.conf \
     --env ADMIN_ENABLED=true \
     --env METRICS_ENABLED=true \
-    pambrose/prometheus-proxy:1.8.7
+    pambrose/prometheus-proxy:1.8.8
 
 docker run --rm -p 8083:8083 -p 8093:8093 \
     --mount type=bind,source="$(pwd)"/testing/certs,target=/app/testing/certs \
@@ -263,7 +263,7 @@ docker run --rm -p 8083:8083 -p 8093:8093 \
     --env AGENT_CONFIG=tls-no-mutual-auth.conf \
     --env PROXY_HOSTNAME=mymachine.lan:50440 \
     --name docker-agent \
-    pambrose/prometheus-agent:1.8.7
+    pambrose/prometheus-agent:1.8.8
 ```
 
 **Note:** The `WORKDIR` of the proxy and agent images is `/app`, so make sure 
diff --git a/bin/docker-agent.sh b/bin/docker-agent.sh
index 71cdf17b..3b729074 100755
--- a/bin/docker-agent.sh
+++ b/bin/docker-agent.sh
@@ -3,4 +3,4 @@
 docker run --rm -p 8083:8083 -p 8093:8093 \
   --env AGENT_CONFIG='https://raw.githubusercontent.com/pambrose/prometheus-proxy/master/examples/simple.conf' \
   --env PROXY_HOSTNAME=mymachine.lan \
-  pambrose/prometheus-agent:1.8.7
+  pambrose/prometheus-agent:1.8.8
diff --git a/bin/docker-proxy.sh b/bin/docker-proxy.sh
index ec47b38e..077650ec 100755
--- a/bin/docker-proxy.sh
+++ b/bin/docker-proxy.sh
@@ -2,4 +2,4 @@
 
 docker run --rm -p 8082:8082 -p 8092:8092 -p 50051:50051 -p 8080:8080 \
   --env PROXY_CONFIG='https://raw.githubusercontent.com/pambrose/prometheus-proxy/master/examples/simple.conf' \
-  pambrose/prometheus-proxy:1.8.7
+  pambrose/prometheus-proxy:1.8.8
diff --git a/build.gradle b/build.gradle
index c86a06dc..fcd009d9 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,16 +1,17 @@
 plugins {
     id 'idea'
     id 'java'
-    id 'org.jetbrains.kotlin.jvm' version '1.4.10'
+    id 'org.jetbrains.kotlin.jvm' version '1.4.30'
     id 'com.google.protobuf' version '0.8.14'
     id "com.github.ben-manes.versions" version '0.36.0'
     id 'com.github.johnrengelman.shadow' version '6.1.0'
+    id 'com.github.gmazzo.buildconfig' version '2.0.2'
     id 'jacoco'
     id 'com.github.kt3k.coveralls' version '2.10.2'
 }
 
 group = 'io.prometheus'
-version = '1.8.7'
+version = '1.8.8'
 
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
@@ -74,6 +75,12 @@ dependencies {
     testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:$junit_version"
 }
 
+buildConfig {
+    buildConfigField('String', 'APP_NAME', "\"${project.name}\"")
+    buildConfigField('String', 'APP_VERSION', "\"${project.version}\"")
+    buildConfigField('String', 'APP_RELEASE_DATE', "\"2/3/21\"")
+}
+
 /*
 sourceSets {
   main.java.srcDirs += ['src/main/java']
diff --git a/etc/compose/proxy.yml b/etc/compose/proxy.yml
index 1d2b9dbc..e23023b2 100644
--- a/etc/compose/proxy.yml
+++ b/etc/compose/proxy.yml
@@ -1,6 +1,6 @@
 prometheus-proxy:
   autoredeploy: true
-  image: 'pambrose/prometheus-proxy:1.8.7'
+  image: 'pambrose/prometheus-proxy:1.8.8'
   ports:
     - '8080:8080'
     - '8082:8082'
diff --git a/gradle.properties b/gradle.properties
index df28ac54..d9b6b598 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -7,19 +7,19 @@ org.gradle.caching=true
 org.gradle.jvmargs=-Xmx2048m -XX:MaxPermSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
 annotation_version=1.3.2
 coroutines_version=1.4.2
-dropwizard_version=4.1.16
-gengrpc_version=0.2.1
-grpc_version=1.34.0
+dropwizard_version=4.1.17
+gengrpc_version=1.0.0
+grpc_version=1.35.0
 jcommander_version=1.78
 jetty_version=9.4.32.v20200930
 junit_version=5.7.0
-kluent_version=1.64
-ktor_version=1.4.2
+kluent_version=1.65
+ktor_version=1.5.0
 logback_version=1.2.3
-logging_version=2.0.3
-prometheus_version=0.9.0
+logging_version=2.0.4
+prometheus_version=0.10.0
 protoc_version=3.12.4
 slf4j_version=1.7.30
 typesafe_version=1.4.1
-utils_version=1.5.0
+utils_version=1.7.0
 zipkin_version=5.12.7
\ No newline at end of file
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 4d9ca164..28ff446a 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.8.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/src/main/kotlin/io/prometheus/Agent.kt b/src/main/kotlin/io/prometheus/Agent.kt
index 3ce09511..4889e59c 100644
--- a/src/main/kotlin/io/prometheus/Agent.kt
+++ b/src/main/kotlin/io/prometheus/Agent.kt
@@ -38,6 +38,7 @@ import io.prometheus.common.ConfigWrappers.newAdminConfig
 import io.prometheus.common.ConfigWrappers.newMetricsConfig
 import io.prometheus.common.ConfigWrappers.newZipkinConfig
 import io.prometheus.common.getVersionDesc
+import io.prometheus.prometheus_proxy.BuildConfig
 import kotlinx.coroutines.*
 import mu.KLogging
 import java.util.concurrent.CountDownLatch
@@ -50,7 +51,7 @@ import kotlin.time.TimeSource.Monotonic
 import kotlin.time.milliseconds
 import kotlin.time.seconds
 
-@Version(version = "1.8.7", date = "12/4/20")
+@Version(version = BuildConfig.APP_VERSION, date = BuildConfig.APP_RELEASE_DATE)
 class Agent(val options: AgentOptions,
             inProcessServerName: String = "",
             testMode: Boolean = false,
diff --git a/src/main/kotlin/io/prometheus/Proxy.kt b/src/main/kotlin/io/prometheus/Proxy.kt
index d9178a0d..9036608d 100644
--- a/src/main/kotlin/io/prometheus/Proxy.kt
+++ b/src/main/kotlin/io/prometheus/Proxy.kt
@@ -38,6 +38,7 @@ import io.prometheus.common.ConfigWrappers.newMetricsConfig
 import io.prometheus.common.ConfigWrappers.newZipkinConfig
 import io.prometheus.common.GrpcObjects.EMPTY_AGENT_ID
 import io.prometheus.common.getVersionDesc
+import io.prometheus.prometheus_proxy.BuildConfig
 import io.prometheus.proxy.*
 import kotlinx.coroutines.runBlocking
 import mu.KLogging
@@ -45,7 +46,7 @@ import java.time.LocalDateTime
 import java.time.format.DateTimeFormatter
 import kotlin.time.milliseconds
 
-@Version(version = "1.8.7", date = "12/4/20")
+@Version(version = BuildConfig.APP_VERSION, date = BuildConfig.APP_RELEASE_DATE)
 class Proxy(val options: ProxyOptions,
             proxyHttpPort: Int = options.proxyHttpPort,
             inProcessServerName: String = "",
@@ -158,6 +159,7 @@ class Proxy(val options: ProxyOptions,
                      agentContextManager.agentContextMap.entries
                        .filter { it.value.scrapeRequestBacklogSize >= unhealthySize }
                        .map { "${it.value} ${it.value.scrapeRequestBacklogSize}" }
+                       .toMutableList()
                    if (vals.isEmpty()) {
                      HealthCheck.Result.healthy()
                    }
diff --git a/src/main/kotlin/io/prometheus/agent/AgentGrpcService.kt b/src/main/kotlin/io/prometheus/agent/AgentGrpcService.kt
index 7de29569..1b085c98 100644
--- a/src/main/kotlin/io/prometheus/agent/AgentGrpcService.kt
+++ b/src/main/kotlin/io/prometheus/agent/AgentGrpcService.kt
@@ -129,6 +129,7 @@ internal class AgentGrpcService(internal val agent: Agent,
     channel =
       channel(hostName = hostName,
               port = port,
+              enableRetry = true,
               tlsContext = tlsContext,
               overrideAuthority = agent.options.overrideAuthority,
               inProcessServerName = inProcessServerName) {
diff --git a/src/main/kotlin/io/prometheus/agent/AgentHttpService.kt b/src/main/kotlin/io/prometheus/agent/AgentHttpService.kt
index c4a2abe3..6617d793 100644
--- a/src/main/kotlin/io/prometheus/agent/AgentHttpService.kt
+++ b/src/main/kotlin/io/prometheus/agent/AgentHttpService.kt
@@ -74,7 +74,10 @@ internal class AgentHttpService(val agent: Agent) {
           val timeout = agent.configVals.agent.internal.cioTimeoutSecs.seconds
           CIO.create { requestTimeout = timeout.toLongMilliseconds() }
             .use { engine ->
-              HttpClient(engine) { install(HttpTimeout) }
+              HttpClient(engine) {
+                expectSuccess = false
+                install(HttpTimeout)
+              }
                 .use { client ->
                   client.get(url,
                              {
diff --git a/src/main/kotlin/io/prometheus/agent/AgentOptions.kt b/src/main/kotlin/io/prometheus/agent/AgentOptions.kt
index d95ccf24..7d223bc0 100644
--- a/src/main/kotlin/io/prometheus/agent/AgentOptions.kt
+++ b/src/main/kotlin/io/prometheus/agent/AgentOptions.kt
@@ -30,7 +30,7 @@ class AgentOptions(argv: Array<String>, exitOnMissingConfig: Boolean) :
     BaseOptions(Agent::class.java.name, argv, AGENT_CONFIG.name, exitOnMissingConfig) {
 
   constructor(args: List<String>, exitOnMissingConfig: Boolean) :
-      this(Iterables.toArray<String>(args, String::class.java), exitOnMissingConfig)
+      this(Iterables.toArray<String>(args.toMutableList(), String::class.java), exitOnMissingConfig)
 
   constructor(configFilename: String, exitOnMissingConfig: Boolean) :
       this(listOf("--config", configFilename), exitOnMissingConfig)
diff --git a/src/main/kotlin/io/prometheus/proxy/ProxyOptions.kt b/src/main/kotlin/io/prometheus/proxy/ProxyOptions.kt
index 6b9b604d..45fc7fdb 100644
--- a/src/main/kotlin/io/prometheus/proxy/ProxyOptions.kt
+++ b/src/main/kotlin/io/prometheus/proxy/ProxyOptions.kt
@@ -27,7 +27,7 @@ import kotlin.time.seconds
 
 class ProxyOptions(argv: Array<String>) : BaseOptions(Proxy::class.java.simpleName, argv, PROXY_CONFIG.name) {
 
-  constructor(args: List<String>) : this(Iterables.toArray<String>(args, String::class.java))
+  constructor(args: List<String>) : this(Iterables.toArray<String>(args.toMutableList(), String::class.java))
 
   @Parameter(names = ["-p", "--port"], description = "Proxy listen port")
   var proxyHttpPort = -1
diff --git a/src/test/kotlin/io/prometheus/AdminDefaultPathTest.kt b/src/test/kotlin/io/prometheus/AdminDefaultPathTest.kt
index a00be68b..381f25c0 100644
--- a/src/test/kotlin/io/prometheus/AdminDefaultPathTest.kt
+++ b/src/test/kotlin/io/prometheus/AdminDefaultPathTest.kt
@@ -40,7 +40,7 @@ class AdminDefaultPathTest {
   fun proxyPingPathTest() {
     proxyConfigVals.admin
       .also { admin ->
-        blockingGet("${admin.port}/${admin.pingPath}".addPrefix()) { response ->
+        blockingGet("${admin.port}/${admin.pingPath}".withPrefix()) { response ->
           response.status shouldBeEqualTo HttpStatusCode.OK
           response.readText() shouldStartWith "pong"
         }
@@ -51,7 +51,7 @@ class AdminDefaultPathTest {
   fun agentPingPathTest() {
     agentConfigVals.admin
       .also { admin ->
-        blockingGet("${admin.port}/${admin.pingPath}".addPrefix()) { response ->
+        blockingGet("${admin.port}/${admin.pingPath}".withPrefix()) { response ->
           response.status shouldBeEqualTo HttpStatusCode.OK
           response.readText() shouldStartWith "pong"
         }
@@ -62,7 +62,7 @@ class AdminDefaultPathTest {
   fun proxyVersionPathTest() {
     agentConfigVals.admin
       .also { admin ->
-        blockingGet("${admin.port}/${admin.versionPath}".addPrefix()) { response ->
+        blockingGet("${admin.port}/${admin.versionPath}".withPrefix()) { response ->
           response.status shouldBeEqualTo HttpStatusCode.OK
           response.readText() shouldContain "Version"
         }
@@ -73,7 +73,7 @@ class AdminDefaultPathTest {
   fun agentVersionPathTest() {
     agentConfigVals.admin
       .also { admin ->
-        blockingGet("${admin.port}/${admin.versionPath}".addPrefix()) { response ->
+        blockingGet("${admin.port}/${admin.versionPath}".withPrefix()) { response ->
           response.status shouldBeEqualTo HttpStatusCode.OK
           response.readText() shouldContain "Version"
         }
@@ -84,7 +84,7 @@ class AdminDefaultPathTest {
   fun proxyHealthCheckPathTest() {
     proxyConfigVals.admin
       .also { admin ->
-        blockingGet("${admin.port}/${admin.healthCheckPath}".addPrefix()) { response ->
+        blockingGet("${admin.port}/${admin.healthCheckPath}".withPrefix()) { response ->
           response.status shouldBeEqualTo HttpStatusCode.OK
           response.readText().length shouldBeGreaterThan 10
         }
@@ -95,7 +95,7 @@ class AdminDefaultPathTest {
   fun agentHealthCheckPathTest() {
     agentConfigVals.admin
       .also { admin ->
-        blockingGet("${admin.port}/${admin.healthCheckPath}".addPrefix()) { response ->
+        blockingGet("${admin.port}/${admin.healthCheckPath}".withPrefix()) { response ->
           response.readText().length shouldBeGreaterThan 10
         }
       }
@@ -105,7 +105,7 @@ class AdminDefaultPathTest {
   fun proxyThreadDumpPathTest() {
     proxyConfigVals.admin
       .also { admin ->
-        blockingGet("${admin.port}/${admin.threadDumpPath}".addPrefix()) { response ->
+        blockingGet("${admin.port}/${admin.threadDumpPath}".withPrefix()) { response ->
           response.readText().length shouldBeGreaterThan 10
         }
       }
@@ -113,7 +113,7 @@ class AdminDefaultPathTest {
 
   @Test
   fun agentThreadDumpPathTest() {
-    blockingGet("${agentConfigVals.admin.port}/${agentConfigVals.admin.threadDumpPath}".addPrefix()) { response ->
+    blockingGet("${agentConfigVals.admin.port}/${agentConfigVals.admin.threadDumpPath}".withPrefix()) { response ->
       response.readText().length shouldBeGreaterThan 10
     }
   }
diff --git a/src/test/kotlin/io/prometheus/AdminEmptyPathTest.kt b/src/test/kotlin/io/prometheus/AdminEmptyPathTest.kt
index 084519b5..1e3a6355 100644
--- a/src/test/kotlin/io/prometheus/AdminEmptyPathTest.kt
+++ b/src/test/kotlin/io/prometheus/AdminEmptyPathTest.kt
@@ -39,7 +39,7 @@ class AdminEmptyPathTest {
         admin.port shouldBeEqualTo 8098
         admin.pingPath shouldBeEqualTo ""
 
-        blockingGet("${admin.port}/${admin.pingPath}".addPrefix()) { response ->
+        blockingGet("${admin.port}/${admin.pingPath}".withPrefix()) { response ->
           response.status shouldBeEqualTo HttpStatusCode.NotFound
         }
       }
@@ -52,7 +52,7 @@ class AdminEmptyPathTest {
         admin.port shouldBeEqualTo 8098
         admin.versionPath shouldBeEqualTo ""
 
-        blockingGet("${admin.port}/${admin.versionPath}".addPrefix()) { response ->
+        blockingGet("${admin.port}/${admin.versionPath}".withPrefix()) { response ->
           response.status shouldBeEqualTo HttpStatusCode.NotFound
         }
       }
@@ -64,7 +64,7 @@ class AdminEmptyPathTest {
       .also { admin ->
         admin.healthCheckPath shouldBeEqualTo ""
 
-        blockingGet("${admin.port}/${admin.healthCheckPath}".addPrefix()) { response ->
+        blockingGet("${admin.port}/${admin.healthCheckPath}".withPrefix()) { response ->
           response.status shouldBeEqualTo HttpStatusCode.NotFound
         }
       }
@@ -76,7 +76,7 @@ class AdminEmptyPathTest {
       .also { admin ->
         admin.threadDumpPath shouldBeEqualTo ""
 
-        blockingGet("${admin.port}/${admin.threadDumpPath}".addPrefix()) { response ->
+        blockingGet("${admin.port}/${admin.threadDumpPath}".withPrefix()) { response ->
           response.status shouldBeEqualTo HttpStatusCode.NotFound
         }
       }
diff --git a/src/test/kotlin/io/prometheus/AdminNonDefaultPathTest.kt b/src/test/kotlin/io/prometheus/AdminNonDefaultPathTest.kt
index 795d5267..c02cd96c 100644
--- a/src/test/kotlin/io/prometheus/AdminNonDefaultPathTest.kt
+++ b/src/test/kotlin/io/prometheus/AdminNonDefaultPathTest.kt
@@ -43,7 +43,7 @@ class AdminNonDefaultPathTest {
         admin.port shouldBeEqualTo 8099
         admin.pingPath shouldBeEqualTo "pingPath2"
 
-        blockingGet("${admin.port}/${admin.pingPath}".addPrefix()) { response ->
+        blockingGet("${admin.port}/${admin.pingPath}".withPrefix()) { response ->
           response.status shouldBeEqualTo HttpStatusCode.OK
           response.readText() shouldStartWith "pong"
         }
@@ -57,7 +57,7 @@ class AdminNonDefaultPathTest {
         admin.port shouldBeEqualTo 8099
         admin.versionPath shouldBeEqualTo "versionPath2"
 
-        blockingGet("${admin.port}/${admin.versionPath}".addPrefix()) { response ->
+        blockingGet("${admin.port}/${admin.versionPath}".withPrefix()) { response ->
           response.status shouldBeEqualTo HttpStatusCode.OK
           response.readText() shouldContain "Version"
         }
@@ -70,7 +70,7 @@ class AdminNonDefaultPathTest {
       .also { admin ->
         admin.healthCheckPath shouldBeEqualTo "healthCheckPath2"
 
-        blockingGet("${admin.port}/${admin.healthCheckPath}".addPrefix()) { response ->
+        blockingGet("${admin.port}/${admin.healthCheckPath}".withPrefix()) { response ->
           response.status shouldBeEqualTo HttpStatusCode.OK
           response.readText().length shouldBeGreaterThan 10
         }
@@ -83,7 +83,7 @@ class AdminNonDefaultPathTest {
       .also { admin ->
         admin.threadDumpPath shouldBeEqualTo "threadDumpPath2"
 
-        blockingGet("${admin.port}/${admin.threadDumpPath}".addPrefix()) { response ->
+        blockingGet("${admin.port}/${admin.threadDumpPath}".withPrefix()) { response ->
           response.readText().length shouldBeGreaterThan 10
         }
       }
diff --git a/src/test/kotlin/io/prometheus/NettyTestWithAdminMetricsTest.kt b/src/test/kotlin/io/prometheus/NettyTestWithAdminMetricsTest.kt
index 2ecfd12d..2f4a7180 100644
--- a/src/test/kotlin/io/prometheus/NettyTestWithAdminMetricsTest.kt
+++ b/src/test/kotlin/io/prometheus/NettyTestWithAdminMetricsTest.kt
@@ -44,7 +44,7 @@ class NettyTestWithAdminMetricsTest : CommonTests(ProxyCallTestArgs(agent = agen
   fun adminDebugCallsTest() {
     runBlocking {
       withHttpClient {
-        get("8093/debug".addPrefix()) { response ->
+        get("8093/debug".withPrefix()) { response ->
           val body = response.readText()
           body.length shouldBeGreaterThan 100
           response.status shouldBeEqualTo HttpStatusCode.OK
@@ -52,7 +52,7 @@ class NettyTestWithAdminMetricsTest : CommonTests(ProxyCallTestArgs(agent = agen
       }
 
       withHttpClient {
-        get("8092/debug".addPrefix()) { response ->
+        get("8092/debug".withPrefix()) { response ->
           val body = response.readText()
           body.length shouldBeGreaterThan 100
           response.status shouldBeEqualTo HttpStatusCode.OK
diff --git a/src/test/kotlin/io/prometheus/ProxyTests.kt b/src/test/kotlin/io/prometheus/ProxyTests.kt
index a50ed8c3..633565b3 100644
--- a/src/test/kotlin/io/prometheus/ProxyTests.kt
+++ b/src/test/kotlin/io/prometheus/ProxyTests.kt
@@ -91,9 +91,9 @@ internal object ProxyTests : KLogging() {
     }
 
     delay(2.seconds) // Give http server a chance to start
-    pathManager.registerPath("/$proxyPath", "$agentPort/$agentPath".addPrefix())
+    pathManager.registerPath("/$proxyPath", "$agentPort/$agentPath".withPrefix())
 
-    blockingGet("$PROXY_PORT/$proxyPath".addPrefix()) { response ->
+    blockingGet("$PROXY_PORT/$proxyPath".withPrefix()) { response ->
       response.status shouldBeEqualTo HttpStatusCode.RequestTimeout
     }
 
@@ -166,7 +166,7 @@ internal object ProxyTests : KLogging() {
     logger.debug { "Registering paths" }
     repeat(args.pathCount) { i ->
       val index = httpServers.size.random()
-      args.agent.pathManager.registerPath("proxy-$i", "${args.startPort + index}/agent-$index".addPrefix())
+      args.agent.pathManager.registerPath("proxy-$i", "${args.startPort + index}/agent-$index".withPrefix())
       pathMap[i] = index
     }
 
@@ -260,7 +260,7 @@ internal object ProxyTests : KLogging() {
     httpIndex.shouldNotBeNull()
 
     withHttpClient(httpClient) {
-      get("$PROXY_PORT/proxy-$index".addPrefix()) { response ->
+      get("$PROXY_PORT/proxy-$index".withPrefix()) { response ->
         val body = response.readText()
         body shouldBeEqualTo contentMap[httpIndex]
         response.status shouldBeEqualTo HttpStatusCode.OK
diff --git a/src/test/kotlin/io/prometheus/SimpleTests.kt b/src/test/kotlin/io/prometheus/SimpleTests.kt
index 6a3fd640..0315147e 100644
--- a/src/test/kotlin/io/prometheus/SimpleTests.kt
+++ b/src/test/kotlin/io/prometheus/SimpleTests.kt
@@ -19,7 +19,7 @@
 package io.prometheus
 
 import com.github.pambrose.common.dsl.KtorDsl.blockingGet
-import io.ktor.http.HttpStatusCode
+import io.ktor.http.*
 import io.prometheus.TestConstants.PROXY_PORT
 import io.prometheus.agent.AgentPathManager
 import kotlinx.coroutines.Dispatchers
@@ -37,14 +37,14 @@ internal object SimpleTests : KLogging() {
 
   fun missingPathTest(caller: String) {
     logger.debug { "Calling missingPathTest() from $caller" }
-    blockingGet("$PROXY_PORT/".addPrefix()) { response ->
+    blockingGet("$PROXY_PORT/".withPrefix()) { response ->
       response.status shouldBeEqualTo HttpStatusCode.NotFound
     }
   }
 
   fun invalidPathTest(caller: String) {
     logger.debug { "Calling invalidPathTest() from $caller" }
-    blockingGet("$PROXY_PORT/invalid_path".addPrefix()) { response ->
+    blockingGet("$PROXY_PORT/invalid_path".withPrefix()) { response ->
       response.status shouldBeEqualTo HttpStatusCode.NotFound
     }
   }
@@ -59,7 +59,7 @@ internal object SimpleTests : KLogging() {
     repeat(TestConstants.REPS) { i ->
       val path = "test-$i"
       pathManager.let { manager ->
-        manager.registerPath(path, "$PROXY_PORT/$path".addPrefix())
+        manager.registerPath(path, "$PROXY_PORT/$path".withPrefix())
         cnt++
         manager.pathMapSize() shouldBeEqualTo originalSize + cnt
         manager.unregisterPath(path)
@@ -72,8 +72,8 @@ internal object SimpleTests : KLogging() {
   suspend fun invalidAgentUrlTest(pathManager: AgentPathManager, caller: String, badPath: String = "badPath") {
     logger.debug { "Calling invalidAgentUrlTest() from $caller" }
 
-    pathManager.registerPath(badPath, "33/metrics".addPrefix())
-    blockingGet("$PROXY_PORT/$badPath".addPrefix()) { response ->
+    pathManager.registerPath(badPath, "33/metrics".withPrefix())
+    blockingGet("$PROXY_PORT/$badPath".withPrefix()) { response ->
       response.status shouldBeEqualTo HttpStatusCode.NotFound
     }
     pathManager.unregisterPath(badPath)
@@ -92,7 +92,7 @@ internal object SimpleTests : KLogging() {
         List(TestConstants.REPS) { i ->
           launch(Dispatchers.Default + exceptionHandler(logger)) {
             val path = "test-$i}"
-            val url = "$PROXY_PORT/$path".addPrefix()
+            val url = "$PROXY_PORT/$path".withPrefix()
             mutex.withLock { paths += path }
             pathManager.registerPath(path, url)
           }
diff --git a/src/test/kotlin/io/prometheus/TestUtils.kt b/src/test/kotlin/io/prometheus/TestUtils.kt
index 5ba268f3..8cc50d74 100644
--- a/src/test/kotlin/io/prometheus/TestUtils.kt
+++ b/src/test/kotlin/io/prometheus/TestUtils.kt
@@ -92,7 +92,5 @@ fun exceptionHandler(logger: KLogger) =
       logger.warn(e) { "CoroutineExceptionHandler caught: $e" }
   }
 
-fun String.addPrefix(): String {
-  val prefix = "http://localhost:"
-  return if (this.startsWith(prefix)) this else (prefix + this)
-}
\ No newline at end of file
+fun String.withPrefix(prefix: String = "http://localhost:") =
+  if (this.startsWith(prefix)) this else (prefix + this)
\ No newline at end of file
diff --git a/src/test/resources/logback-test.xml b/src/test/resources/logback-test.xml
new file mode 100644
index 00000000..28c7009c
--- /dev/null
+++ b/src/test/resources/logback-test.xml
@@ -0,0 +1,12 @@
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{YYYY-MM-dd HH:mm:ss.SSS} [%thread] %-5level [%file:%line] - %msg%n</pattern>
+        </encoder>
+    </appender>
+    <root level="INFO">
+        <appender-ref ref="STDOUT"/>
+    </root>
+    <logger name="org.eclipse.jetty" level="INFO"/>
+    <logger name="io.netty" level="INFO"/>
+</configuration>