diff --git a/agent/pkg/har/utils.go b/agent/pkg/har/utils.go
index 24e04e853..3c1289858 100644
--- a/agent/pkg/har/utils.go
+++ b/agent/pkg/har/utils.go
@@ -124,8 +124,8 @@ func NewRequest(request map[string]interface{}) (harRequest *Request, err error)
 
 	postData, _ := request["postData"].(map[string]interface{})
 	mimeType := postData["mimeType"]
-	if mimeType == nil || len(mimeType.(string)) == 0 {
-		mimeType = "text/html"
+	if mimeType == nil {
+		mimeType = ""
 	}
 	text := postData["text"]
 	postDataText := ""
@@ -177,8 +177,8 @@ func NewResponse(response map[string]interface{}) (harResponse *Response, err er
 
 	content, _ := response["content"].(map[string]interface{})
 	mimeType := content["mimeType"]
-	if mimeType == nil || len(mimeType.(string)) == 0 {
-		mimeType = "text/html"
+	if mimeType == nil {
+		mimeType = ""
 	}
 	encoding := content["encoding"]
 	text := content["text"]
diff --git a/tap/extensions/http/Makefile b/tap/extensions/http/Makefile
index 1bdbf379b..41e520dad 100644
--- a/tap/extensions/http/Makefile
+++ b/tap/extensions/http/Makefile
@@ -13,4 +13,4 @@ test-pull-bin:
 
 test-pull-expect:
 	@mkdir -p expect
-	@[ "${skipexpect}" ] && echo "Skipping downloading expected JSONs" || gsutil  -o 'GSUtil:parallel_process_count=5' -o 'GSUtil:parallel_thread_count=5'  -m cp -r gs://static.up9.io/mizu/test-pcap/expect8/http/\* expect
+	@[ "${skipexpect}" ] && echo "Skipping downloading expected JSONs" || gsutil  -o 'GSUtil:parallel_process_count=5' -o 'GSUtil:parallel_thread_count=5'  -m cp -r gs://static.up9.io/mizu/test-pcap/expect9/http/\* expect
diff --git a/tap/extensions/http/main.go b/tap/extensions/http/main.go
index 6b32cc72f..e8131076a 100644
--- a/tap/extensions/http/main.go
+++ b/tap/extensions/http/main.go
@@ -401,8 +401,8 @@ func representRequest(request map[string]interface{}) (repRequest []interface{})
 
 	postData, _ := request["postData"].(map[string]interface{})
 	mimeType := postData["mimeType"]
-	if mimeType == nil || len(mimeType.(string)) == 0 {
-		mimeType = "text/html"
+	if mimeType == nil {
+		mimeType = ""
 	}
 	text := postData["text"]
 	if text != nil {
@@ -483,8 +483,8 @@ func representResponse(response map[string]interface{}) (repResponse []interface
 
 	content, _ := response["content"].(map[string]interface{})
 	mimeType := content["mimeType"]
-	if mimeType == nil || len(mimeType.(string)) == 0 {
-		mimeType = "text/html"
+	if mimeType == nil {
+		mimeType = ""
 	}
 	encoding := content["encoding"]
 	text := content["text"]