diff --git a/spring-cloud-sleuth-zipkin/src/main/java/org/springframework/cloud/sleuth/zipkin2/sender/RestTemplateSender.java b/spring-cloud-sleuth-zipkin/src/main/java/org/springframework/cloud/sleuth/zipkin2/sender/RestTemplateSender.java
index 5b6c123ec..982dcb0d9 100644
--- a/spring-cloud-sleuth-zipkin/src/main/java/org/springframework/cloud/sleuth/zipkin2/sender/RestTemplateSender.java
+++ b/spring-cloud-sleuth-zipkin/src/main/java/org/springframework/cloud/sleuth/zipkin2/sender/RestTemplateSender.java
@@ -129,6 +129,11 @@ final class RestTemplateSender extends Sender {
 		this.restTemplate.exchange(requestEntity, String.class);
 	}
 
+	@Override
+	public String toString() {
+		return "RestTemplateSender{" + url + "}";
+	}
+
 	class HttpPostCall extends Call.Base<Void> {
 
 		private final byte[] message;
diff --git a/spring-cloud-sleuth-zipkin/src/test/java/org/springframework/cloud/sleuth/zipkin2/sender/RestTemplateSenderTest.java b/spring-cloud-sleuth-zipkin/src/test/java/org/springframework/cloud/sleuth/zipkin2/sender/RestTemplateSenderTest.java
index dbbc13eb7..63fb32211 100644
--- a/spring-cloud-sleuth-zipkin/src/test/java/org/springframework/cloud/sleuth/zipkin2/sender/RestTemplateSenderTest.java
+++ b/spring-cloud-sleuth-zipkin/src/test/java/org/springframework/cloud/sleuth/zipkin2/sender/RestTemplateSenderTest.java
@@ -28,6 +28,8 @@ import zipkin2.Endpoint;
 import zipkin2.Span;
 import zipkin2.codec.Encoding;
 import zipkin2.codec.SpanBytesEncoder;
+import zipkin2.reporter.Sender;
+import zipkin2.reporter.brave.AsyncZipkinSpanHandler;
 
 import org.springframework.web.client.RestTemplate;
 
@@ -49,9 +51,9 @@ public class RestTemplateSenderTest {
 	@Rule
 	public MockWebServer server = new MockWebServer();
 
-	String endpoint = this.server.url("/api/v2/spans").toString();
+	String baseUrl = "http://localhost:" + this.server.getPort();
 
-	RestTemplateSender sender = new RestTemplateSender(new RestTemplate(), this.endpoint,
+	RestTemplateSender sender = new RestTemplateSender(new RestTemplate(), this.baseUrl,
 			JSON_V2);
 
 	/**
@@ -71,7 +73,7 @@ public class RestTemplateSenderTest {
 	@Test
 	public void proto3() throws Exception {
 		this.server.enqueue(new MockResponse());
-		this.sender = new RestTemplateSender(new RestTemplate(), this.endpoint, PROTO3);
+		this.sender = new RestTemplateSender(new RestTemplate(), this.baseUrl, PROTO3);
 
 		send(SPAN).execute();
 
@@ -83,6 +85,19 @@ public class RestTemplateSenderTest {
 				.containsExactly(SpanBytesEncoder.PROTO3.encode(SPAN));
 	}
 
+	/**
+	 * The output of toString() on {@link Sender} implementations appears in thread names
+	 * created by {@link AsyncZipkinSpanHandler}. Since thread names are likely to be
+	 * exposed in logs and other monitoring tools, care should be taken to ensure the
+	 * toString() output is a reasonable length and does not contain sensitive
+	 * information.
+	 */
+	@Test
+	public void toStringContainsOnlySenderTypeAndEndpoint() {
+		assertThat(sender.toString())
+				.isEqualTo("RestTemplateSender{" + baseUrl + "/api/v2/spans}");
+	}
+
 	Call<Void> send(Span... spans) {
 		SpanBytesEncoder bytesEncoder = this.sender.encoding() == Encoding.JSON
 				? SpanBytesEncoder.JSON_V2 : SpanBytesEncoder.PROTO3;