fix: override writeTo to allow repeated consumption

Author: QizhengMo

arex-instrumentation/httpclient/arex-httpclient-apache-v4/src/main/java/io/arex/inst/httpclient/apache/common/ApacheHttpClientAdapter.java

@@ -142,7 +142,7 @@ public static void bufferRequestEntity(HttpEntityEnclosingRequest enclosingReque
         try {
             enclosingRequest.setEntity(new ArexBufferedHttpEntity(enclosingRequest.getEntity()));
         } catch (Exception ignore) {
-            // ignore exception
+            // ignore exception, fallback to original entity and ignore recording
         }
     }
 
@@ -153,7 +153,7 @@ public static void bufferResponseEntity(HttpResponse response) {
         try {
             EntityUtils.updateEntity(response, new ArexBufferedHttpEntity(response.getEntity()));
         } catch (Exception e) {
-            // ignore exception
+            // ignore exception, fallback to original entity and ignore recording
         }
     }
 

arex-instrumentation/httpclient/arex-httpclient-apache-v4/src/main/java/io/arex/inst/httpclient/apache/common/ArexBufferedHttpEntity.java

@@ -4,6 +4,7 @@
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.io.OutputStream;
 import org.apache.http.HttpEntity;
 import org.apache.http.entity.HttpEntityWrapper;
 
@@ -36,4 +37,13 @@ public ArexBufferedHttpEntity(HttpEntity wrappedEntity) throws IOException {
   public InputStream getContent() throws IOException {
     return new ByteArrayInputStream(buffer);
   }
+
+  @Override
+  public void writeTo(final OutputStream outStream) throws IOException {
+    if (this.buffer != null) {
+      outStream.write(this.buffer);
+    } else {
+      super.writeTo(outStream);
+    }
+  }
 }