add nil check of req.body and resp.body on ReleaseBody (#1266)

http.go

@@ -261,7 +261,7 @@ func (resp *Response) IsBodyStream() bool {
 //
 // Note that GET and HEAD requests cannot have body.
 //
-/// See also SetBodyStream.
+// See also SetBodyStream.
 func (req *Request) SetBodyStreamWriter(sw StreamWriter) {
 	sr := NewStreamReader(sw)
 	req.SetBodyStream(sr, -1)
@@ -582,6 +582,9 @@ func (req *Request) SetBodyRaw(body []byte) {
 // The majority of workloads don't need this method.
 func (resp *Response) ReleaseBody(size int) {
 	resp.bodyRaw = nil
+	if resp.body == nil {
+		return
+	}
 	if cap(resp.body.B) > size {
 		resp.closeBodyStream() //nolint:errcheck
 		resp.body = nil
@@ -597,6 +600,9 @@ func (resp *Response) ReleaseBody(size int) {
 // The majority of workloads don't need this method.
 func (req *Request) ReleaseBody(size int) {
 	req.bodyRaw = nil
+	if req.body == nil {
+		return
+	}
 	if cap(req.body.B) > size {
 		req.closeBodyStream() //nolint:errcheck
 		req.body = nil