diff --git a/modules/transports/core/nhttp/src/main/java/org/apache/synapse/transport/passthru/ClientWorker.java b/modules/transports/core/nhttp/src/main/java/org/apache/synapse/transport/passthru/ClientWorker.java
index 4c0a841ae5..a5e8d59ecd 100644
--- a/modules/transports/core/nhttp/src/main/java/org/apache/synapse/transport/passthru/ClientWorker.java
+++ b/modules/transports/core/nhttp/src/main/java/org/apache/synapse/transport/passthru/ClientWorker.java
@@ -181,7 +181,7 @@ public int compare(String o1, String o2) {
         });
 
         for (Map.Entry<String, String> headerEntry : headerEntries) {
-            if (headerMap.containsKey(headerEntry.getKey())) {
+            if (headerMap.containsKey(headerEntry.getKey()) && !conf.isIgnoreCaseSensitiveHeaders()) {
                 excessHeaders.put(headerEntry.getKey(), headerMap.get(headerEntry.getKey()));
             }
             headerMap.put(headerEntry.getKey(), headerEntry.getValue());
diff --git a/modules/transports/core/nhttp/src/main/java/org/apache/synapse/transport/passthru/config/PassThroughConfigPNames.java b/modules/transports/core/nhttp/src/main/java/org/apache/synapse/transport/passthru/config/PassThroughConfigPNames.java
index 931e1d32e4..57f65026d4 100644
--- a/modules/transports/core/nhttp/src/main/java/org/apache/synapse/transport/passthru/config/PassThroughConfigPNames.java
+++ b/modules/transports/core/nhttp/src/main/java/org/apache/synapse/transport/passthru/config/PassThroughConfigPNames.java
@@ -177,4 +177,9 @@ public interface PassThroughConfigPNames {
      * Defines whether viewing services are enabled or not
      */
     public String BLOCK_SERVICE_LIST = "http.block_service_list";
+
+    /**
+     * Defines whether to ignore case-sensitive headers from excess headers map
+     */
+    public String IGNORE_CASE_SENSITIVE_HEADERS = "ignore_case_sensitive_headers";
 }
diff --git a/modules/transports/core/nhttp/src/main/java/org/apache/synapse/transport/passthru/config/PassThroughConfiguration.java b/modules/transports/core/nhttp/src/main/java/org/apache/synapse/transport/passthru/config/PassThroughConfiguration.java
index d1268e6fdd..6d739ec433 100644
--- a/modules/transports/core/nhttp/src/main/java/org/apache/synapse/transport/passthru/config/PassThroughConfiguration.java
+++ b/modules/transports/core/nhttp/src/main/java/org/apache/synapse/transport/passthru/config/PassThroughConfiguration.java
@@ -387,4 +387,14 @@ public String getPassThroughDefaultServiceName() {
         }
         return passThroughDefaultServiceName;
     }
+
+    /**
+     * Get the value of the property to ignore case-sensitive headers from excess headers
+     *
+     * @return Value of the property
+     */
+    public boolean isIgnoreCaseSensitiveHeaders() {
+        return ConfigurationBuilderUtil.getBooleanProperty(PassThroughConfigPNames.IGNORE_CASE_SENSITIVE_HEADERS,
+                false, props);
+    }
 }