diff --git a/zap/src/main/java/org/parosproxy/paros/network/HttpMessage.java b/zap/src/main/java/org/parosproxy/paros/network/HttpMessage.java
index 4ace36efe4b..b8c79009717 100644
--- a/zap/src/main/java/org/parosproxy/paros/network/HttpMessage.java
+++ b/zap/src/main/java/org/parosproxy/paros/network/HttpMessage.java
@@ -129,7 +129,11 @@ public class HttpMessage implements Message {
                 body.setContentEncodings(encodings);
             };
 
+    private static final CharsetProvider DEFAULT_CHARSET_PROVIDER =
+            (header, body) -> header.getCharset();
+
     private static HttpEncodingsHandler contentEncodingsHandler;
+    private static CharsetProvider charsetProvider;
 
     private HttpRequestHeader mReqHeader = new HttpRequestHeader();
     private HttpRequestBody mReqBody = new HttpRequestBody();
@@ -508,7 +512,7 @@ public void setRequestBody(byte[] body) {
     }
 
     private static void setBodyCharset(HttpBody body, HttpHeader header) {
-        String charset = header.getCharset();
+        String charset = getCharset(header, body);
         body.setCharset(charset);
 
         if (charset != null
@@ -524,6 +528,25 @@ private static void setBodyCharset(HttpBody body, HttpHeader header) {
         }
     }
 
+    /**
+     * Sets the provider of charset.
+     *
+     * <p><strong>Note:</strong> Not part of the public API.
+     *
+     * @param provider the provider.
+     */
+    public static void setCharsetProvider(CharsetProvider provider) {
+        charsetProvider = provider;
+    }
+
+    private static String getCharset(HttpHeader header, HttpBody body) {
+        var localProvider = charsetProvider;
+        if (localProvider == null) {
+            localProvider = DEFAULT_CHARSET_PROVIDER;
+        }
+        return localProvider.get(header, body);
+    }
+
     /**
      * Resets the set of warned content-type values.
      *
@@ -1327,4 +1350,9 @@ public interface HttpEncodingsHandler {
 
         void handle(HttpHeader header, HttpBody body);
     }
+
+    /** <strong>Note:</strong> Not part of the public API. */
+    public interface CharsetProvider {
+        String get(HttpHeader header, HttpBody body);
+    }
 }
diff --git a/zap/src/test/java/org/parosproxy/paros/network/HttpMessageUnitTest.java b/zap/src/test/java/org/parosproxy/paros/network/HttpMessageUnitTest.java
index 36dc3071fb4..dd652abbe82 100644
--- a/zap/src/test/java/org/parosproxy/paros/network/HttpMessageUnitTest.java
+++ b/zap/src/test/java/org/parosproxy/paros/network/HttpMessageUnitTest.java
@@ -73,6 +73,7 @@ class HttpMessageUnitTest {
     @AfterEach
     void cleanUp() throws Exception {
         HttpMessage.setContentEncodingsHandler(null);
+        HttpMessage.setCharsetProvider(null);
         HttpMessage.resetWarnedContentTypeValues();
         Configurator.reconfigure(getClass().getResource("/log4j2-test.properties").toURI());
     }
@@ -586,6 +587,19 @@ void shouldNotBeWebSocketUpgradeIfResponseMissUpgradeHeader() throws Exception {
         assertThat(webSocketUpgrade, is(equalTo(false)));
     }
 
+    @Test
+    void shouldUseCharsetProviderWhenSettingRequestBody() {
+        // Given
+        HttpMessage.setCharsetProvider((header, body) -> "UTF-16BE");
+        HttpMessage message = new HttpMessage();
+        withLoggerAppender();
+        // When
+        message.setRequestBody("");
+        // Then
+        assertThat(message.getRequestBody().getCharset(), is(equalTo("UTF-16BE")));
+        assertThat(testAppender.getLogEvents(), hasSize(0));
+    }
+
     @ParameterizedTest
     @MethodSource(value = "setBodyData")
     void shouldUseContentTypeCharsetWhenSettingRequestBody(
@@ -698,6 +712,19 @@ static Stream<Arguments> getNonPostMethods() {
                 .map(Arguments::arguments);
     }
 
+    @Test
+    void shouldUseCharsetProviderWhenSettingResponseBody() {
+        // Given
+        HttpMessage.setCharsetProvider((header, body) -> "UTF-16LE");
+        HttpMessage message = new HttpMessage();
+        withLoggerAppender();
+        // When
+        message.setResponseBody("");
+        // Then
+        assertThat(message.getResponseBody().getCharset(), is(equalTo("UTF-16LE")));
+        assertThat(testAppender.getLogEvents(), hasSize(0));
+    }
+
     @ParameterizedTest
     @MethodSource(value = "setBodyData")
     void shouldUseContentTypeCharsetWhenSettingResponseBody(