diff --git a/requesturi/bytes_tolerant.go b/requesturi/bytes_tolerant.go
new file mode 100644
index 0000000..c36fa6a
--- /dev/null
+++ b/requesturi/bytes_tolerant.go
@@ -0,0 +1,30 @@
+package requesturi
+
+import (
+	"sourcecode.social/reiver/go-rfc2616/sp"
+)
+
+func BytesTolerant(p []byte) (result []byte, rest []byte, ok bool) {
+
+	if len(p) <= 0 {
+		return nil, nil, false
+	}
+
+	{
+		p0 := p[0]
+
+		if sp.ByteIsTolerant(p0) || '\r' == p0 || '\n' == p0 {
+			return nil, p, false
+		}
+	}
+
+	{
+		for i,b := range p {
+			if sp.ByteIsTolerant(p0) || '\r' == p0 || '\n' == p0 {
+				return p[:i], p[i:], true
+			}
+		}
+
+		return p, nil, true
+	}
+}