diff --git a/httpasyncclient/src/main/java/io/opentracing/contrib/httpcomponents/SpanHttpAsync.java b/httpasyncclient/src/main/java/io/opentracing/contrib/httpcomponents/SpanHttpAsync.java
index 7b8a872..a09cce5 100644
--- a/httpasyncclient/src/main/java/io/opentracing/contrib/httpcomponents/SpanHttpAsync.java
+++ b/httpasyncclient/src/main/java/io/opentracing/contrib/httpcomponents/SpanHttpAsync.java
@@ -13,11 +13,15 @@ private SpanHttpAsync() {
     }
 
     public static CloseableHttpAsyncClient trace(CloseableHttpAsyncClient client) {
+        return SpanHttpAsync.trace(client, NoOpSpanModifier.INSTANCE);
+    }
+
+    public static CloseableHttpAsyncClient trace(CloseableHttpAsyncClient client, SpanModifier spanModifier) {
         final HttpTaggerFactory taggerFactory = CombinedHttpTagger.factory(Arrays.asList(
             StandardHttpTagger.FACTORY,
             ContentHttpTagger.FACTORY
         ));
-        return new SpanHttpAsyncClient(new ContextAsyncClient(client, Context.DEFAULT), GlobalTracer.get(), ContextSpan.DEFAULT, taggerFactory);
+        return new SpanHttpAsyncClient(new ContextAsyncClient(client, Context.DEFAULT), GlobalTracer.get(), ContextSpan.DEFAULT, taggerFactory, spanModifier);
     }
 
 }
diff --git a/httpasyncclient/src/main/java/io/opentracing/contrib/httpcomponents/SpanHttpAsyncClient.java b/httpasyncclient/src/main/java/io/opentracing/contrib/httpcomponents/SpanHttpAsyncClient.java
index 03d2e0b..bbbdafd 100644
--- a/httpasyncclient/src/main/java/io/opentracing/contrib/httpcomponents/SpanHttpAsyncClient.java
+++ b/httpasyncclient/src/main/java/io/opentracing/contrib/httpcomponents/SpanHttpAsyncClient.java
@@ -20,12 +20,18 @@ public class SpanHttpAsyncClient extends CloseableHttpAsyncClient {
     private final Tracer tracer;
     private final ContextSpan contextSpan;
     private final HttpTaggerFactory taggerFactory;
+    private final SpanModifier spanModifier;
 
     public SpanHttpAsyncClient(final CloseableHttpAsyncClient client, final Tracer tracer, final ContextSpan contextSpan, final HttpTaggerFactory taggerFactory) {
+        this(client, tracer, contextSpan, taggerFactory, NoOpSpanModifier.INSTANCE);
+    }
+
+    public SpanHttpAsyncClient(final CloseableHttpAsyncClient client, final Tracer tracer, final ContextSpan contextSpan, final HttpTaggerFactory taggerFactory, SpanModifier spanModifier) {
         this.client = client;
         this.tracer = tracer;
         this.contextSpan = contextSpan;
         this.taggerFactory = taggerFactory;
+        this.spanModifier = spanModifier;
     }
 
     public boolean isRunning() {
@@ -49,6 +55,9 @@ public <T> Future<T> execute(HttpAsyncRequestProducer producer, HttpAsyncRespons
             .asChildOf(parentSpan)
             .withTag(Tags.SPAN_KIND.getKey(), Tags.SPAN_KIND_CLIENT)
             .start();
+        if (this.spanModifier != null) {
+            this.spanModifier.modify(span);
+        }
         HttpTagger tagger = taggerFactory.create(span, context);
         return contextSpan.set(span).supply(() -> client.execute(
             new SpanHttpAsyncRequestProducer(producer, tracer, span, tagger),
diff --git a/httpclient/src/main/java/io/opentracing/contrib/httpcomponents/SpanExec.java b/httpclient/src/main/java/io/opentracing/contrib/httpcomponents/SpanExec.java
index 50d36fb..eb739d5 100644
--- a/httpclient/src/main/java/io/opentracing/contrib/httpcomponents/SpanExec.java
+++ b/httpclient/src/main/java/io/opentracing/contrib/httpcomponents/SpanExec.java
@@ -21,12 +21,18 @@ public class SpanExec implements ClientExecChain {
     private final ContextSpan contextSpan;
     private final HttpTaggerFactory taggerFactory;
     private final Tracer tracer;
+    private final SpanModifier spanModifier;
 
     public SpanExec(ClientExecChain exec, Tracer tracer, ContextSpan contextSpan, HttpTaggerFactory taggerFactory) {
+        this(exec, tracer, contextSpan, taggerFactory,  NoOpSpanModifier.INSTANCE);
+    }
+
+    public SpanExec(ClientExecChain exec, Tracer tracer, ContextSpan contextSpan, HttpTaggerFactory taggerFactory, SpanModifier spanModifier) {
         this.exec = exec;
         this.contextSpan = contextSpan;
         this.taggerFactory = taggerFactory;
         this.tracer = tracer;
+        this.spanModifier = spanModifier;
     }
 
     public CloseableHttpResponse execute(HttpRoute route, HttpRequestWrapper request, HttpClientContext context, HttpExecutionAware execAware) throws IOException, HttpException {
@@ -39,6 +45,9 @@ public CloseableHttpResponse execute(HttpRoute route, HttpRequestWrapper request
                 .withTag(Tags.SPAN_KIND.getKey(), Tags.SPAN_KIND_CLIENT);
                 
         Span span = spanBuilder.start();
+        if (this.spanModifier != null) {
+            this.spanModifier.modify(span);
+        }
         this.tracer.inject(span.context(), Format.Builtin.HTTP_HEADERS, new HttpRequestTextMap(request));
         return contextSpan.set(span).<CloseableHttpResponse, HttpException, IOException>supplyException2(() -> {
             HttpTagger tagger = taggerFactory.create(span, context);
diff --git a/httpclient/src/main/java/io/opentracing/contrib/httpcomponents/SpanHttp.java b/httpclient/src/main/java/io/opentracing/contrib/httpcomponents/SpanHttp.java
index 82db0bd..746fbf5 100644
--- a/httpclient/src/main/java/io/opentracing/contrib/httpcomponents/SpanHttp.java
+++ b/httpclient/src/main/java/io/opentracing/contrib/httpcomponents/SpanHttp.java
@@ -8,9 +8,14 @@ private SpanHttp() {
     }
 
     public static HttpClientBuilder trace() {
+        return SpanHttp.trace(NoOpSpanModifier.INSTANCE);
+    }
+
+    public static HttpClientBuilder trace(SpanModifier spanModifier) {
         return new SpanHttpClientBuilder()
             .addTaggerFactory(StandardHttpTagger.FACTORY)
-            .addTaggerFactory(ContentHttpTagger.FACTORY);
+            .addTaggerFactory(ContentHttpTagger.FACTORY)
+            .setSpanModifier(spanModifier);
     }
 
 }
diff --git a/httpclient/src/main/java/io/opentracing/contrib/httpcomponents/SpanHttpClientBuilder.java b/httpclient/src/main/java/io/opentracing/contrib/httpcomponents/SpanHttpClientBuilder.java
index 06a9b88..b619f20 100644
--- a/httpclient/src/main/java/io/opentracing/contrib/httpcomponents/SpanHttpClientBuilder.java
+++ b/httpclient/src/main/java/io/opentracing/contrib/httpcomponents/SpanHttpClientBuilder.java
@@ -13,6 +13,7 @@ public class SpanHttpClientBuilder extends HttpClientBuilder {
     private final List<HttpTaggerFactory> taggers;
     private Tracer tracer;
     private ContextSpan contextSpan;
+    private SpanModifier spanModifier = NoOpSpanModifier.INSTANCE;
     private String name;
 
     public SpanHttpClientBuilder() {
@@ -30,6 +31,11 @@ public SpanHttpClientBuilder setSpanManager(ContextSpan contextSpan) {
         return this;
     }
 
+    public SpanHttpClientBuilder setSpanModifier(SpanModifier spanModifier) {
+        this.spanModifier = spanModifier;
+        return this;
+    }
+
     public SpanHttpClientBuilder setTracer(Tracer tracer) {
         this.tracer = tracer;
         return this;
@@ -38,7 +44,7 @@ public SpanHttpClientBuilder setTracer(Tracer tracer) {
     protected ClientExecChain decorateMainExec(ClientExecChain exec) {
         Tracer tracer = this.tracer != null ? this.tracer : GlobalTracer.get();
         ContextSpan contextSpan = this.contextSpan != null ? this.contextSpan : ContextSpan.DEFAULT;
-        return new SpanExec(exec, tracer, contextSpan, CombinedHttpTagger.factory(taggers));
+        return new SpanExec(exec, tracer, contextSpan, CombinedHttpTagger.factory(taggers), this.spanModifier);
     }
 
 }
diff --git a/httpcore/src/main/java/io/opentracing/contrib/httpcomponents/SpanModifier.java b/httpcore/src/main/java/io/opentracing/contrib/httpcomponents/SpanModifier.java
new file mode 100644
index 0000000..1412e0a
--- /dev/null
+++ b/httpcore/src/main/java/io/opentracing/contrib/httpcomponents/SpanModifier.java
@@ -0,0 +1,13 @@
+package io.opentracing.contrib.httpcomponents;
+
+import io.opentracing.Span;
+
+@FunctionalInterface
+interface SpanModifier {
+    public void modify(Span span);
+}
+
+class NoOpSpanModifier implements SpanModifier {
+    public static SpanModifier INSTANCE = new NoOpSpanModifier();
+    public void modify(Span span) {}
+}