diff --git a/webtau-core/src/main/java/com/twosigma/webtau/expectation/equality/handlers/ByteArrayCompareToHandler.java b/webtau-core/src/main/java/com/twosigma/webtau/expectation/equality/handlers/ByteArrayCompareToHandler.java
index fb8aba41f..6be0a8e7c 100644
--- a/webtau-core/src/main/java/com/twosigma/webtau/expectation/equality/handlers/ByteArrayCompareToHandler.java
+++ b/webtau-core/src/main/java/com/twosigma/webtau/expectation/equality/handlers/ByteArrayCompareToHandler.java
@@ -21,8 +21,8 @@
 import com.twosigma.webtau.expectation.equality.CompareToComparator;
 import com.twosigma.webtau.expectation.equality.CompareToHandler;
 
-import javax.xml.bind.DatatypeConverter;
 import java.util.Arrays;
+import java.util.Formatter;
 import java.util.Objects;
 
 public class ByteArrayCompareToHandler implements CompareToHandler {
@@ -78,6 +78,15 @@ private String portionOfArrayAsHex(byte[] array, int startIdx) {
 
         String possibleEllipsisPrefix = startIdx > 0 ? "..." : "";
         String possibleEllipsisSuffix = (startIdx + len) < array.length ? "..." : "";
-        return possibleEllipsisPrefix + DatatypeConverter.printHexBinary(subArray) + possibleEllipsisSuffix;
+        return possibleEllipsisPrefix + renderAsHex(subArray) + possibleEllipsisSuffix;
+    }
+
+    private String renderAsHex(byte[] content) {
+        Formatter formatter = new Formatter();
+        for (byte b : content) {
+            formatter.format("%02X", b);
+        }
+
+        return formatter.toString();
     }
 }
diff --git a/webtau-rest/src/main/java/com/twosigma/webtau/http/HttpDocumentation.java b/webtau-rest/src/main/java/com/twosigma/webtau/http/HttpDocumentation.java
index 0c1820a9e..c9a7787b3 100644
--- a/webtau-rest/src/main/java/com/twosigma/webtau/http/HttpDocumentation.java
+++ b/webtau-rest/src/main/java/com/twosigma/webtau/http/HttpDocumentation.java
@@ -38,7 +38,7 @@ public void capture(String artifactName) {
                     requestHeader);
         }
 
-        if (lastValidationResult.getRequestType() != null) {
+        if (lastValidationResult.getRequestType() != null && !lastValidationResult.isRequestBinary()) {
             String fileName = "request." + fileExtensionForType(lastValidationResult.getRequestType());
             FileUtils.writeTextContent(path.resolve(fileName),
                     prettyPrintContent(lastValidationResult.getRequestType(),
diff --git a/webtau-rest/src/main/java/com/twosigma/webtau/http/validation/HttpValidationResult.java b/webtau-rest/src/main/java/com/twosigma/webtau/http/validation/HttpValidationResult.java
index a6c667c0c..8ff7ac134 100644
--- a/webtau-rest/src/main/java/com/twosigma/webtau/http/validation/HttpValidationResult.java
+++ b/webtau-rest/src/main/java/com/twosigma/webtau/http/validation/HttpValidationResult.java
@@ -93,6 +93,10 @@ public String getRequestType() {
         return requestBody != null ? requestBody.type() : null;
     }
 
+    public boolean isRequestBinary() {
+        return requestBody != null && requestBody.isBinary();
+    }
+
     public String getResponseType() {
         return response.getContentType();
     }