diff --git a/method/bytes_tolerant.go b/method/bytes_tolerant.go
new file mode 100644
index 0000000..002bf80
--- /dev/null
+++ b/method/bytes_tolerant.go
@@ -0,0 +1,26 @@
+package method
+
+func BytesTolerant(p []byte) (result []byte, rest []byte, ok bool) {
+
+	if len(p) <= 0 {
+		return nil, nil, false
+	}
+
+	{
+		p0 := p[0]
+
+		if ' ' == p0 || '\t' == p0 || '\r' == p0 || '\n' == p0 {
+			return nil, p, false
+		}
+	}
+
+	{
+		for i,b := range p {
+			if ' ' == b || '\t' == b || '\r' == b || '\n' == b {
+				return p[:i], p[i:], true
+			}
+		}
+
+		return p, nil, true
+	}
+}
diff --git a/method/bytes_tolerant_test.go b/method/bytes_tolerant_test.go
new file mode 100644
index 0000000..425f34f
--- /dev/null
+++ b/method/bytes_tolerant_test.go
@@ -0,0 +1,493 @@
+package method_test
+
+import (
+	"testing"
+
+	"bytes"
+
+	"sourcecode.social/reiver/go-rfc2616/method"
+)
+
+func TestBytesTolerant(t *testing.T) {
+
+	tests := []struct{
+		Value []byte
+		ExpectedResult []byte
+		ExpectedRest []byte
+		ExpectedOK bool
+	}{
+		{
+			Value: nil,
+			ExpectedResult: nil,
+			ExpectedRest: nil,
+			ExpectedOK: false,
+		},
+		{
+			Value: []byte(nil),
+			ExpectedResult: nil,
+			ExpectedRest: nil,
+			ExpectedOK: false,
+		},
+
+
+
+		{
+			Value: []byte{},
+			ExpectedResult: nil,
+			ExpectedRest: nil,
+			ExpectedOK: false,
+		},
+		{
+			Value: []byte(""),
+			ExpectedResult: nil,
+			ExpectedRest: nil,
+			ExpectedOK: false,
+		},
+
+
+
+		{
+			Value:        []byte(" "),
+			ExpectedResult: nil,
+			ExpectedRest: []byte(" "),
+			ExpectedOK: false,
+		},
+		{
+			Value:        []byte("\t"),
+			ExpectedResult: nil,
+			ExpectedRest: []byte("\t"),
+			ExpectedOK: false,
+		},
+		{
+			Value:        []byte("\r"),
+			ExpectedResult: nil,
+			ExpectedRest: []byte("\r"),
+			ExpectedOK: false,
+		},
+		{
+			Value: []byte("\n"),
+			ExpectedResult: nil,
+			ExpectedRest: []byte("\n"),
+			ExpectedOK: false,
+		},
+
+
+
+		{
+			Value:          []byte("CONNECT"),
+			ExpectedResult: []byte("CONNECT"),
+			ExpectedRest: nil,
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("DELETE"),
+			ExpectedResult: []byte("DELETE"),
+			ExpectedRest: nil,
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("GET"),
+			ExpectedResult: []byte("GET"),
+			ExpectedRest: nil,
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("HEAD"),
+			ExpectedResult: []byte("HEAD"),
+			ExpectedRest: nil,
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("PATCH"),
+			ExpectedResult: []byte("PATCH"),
+			ExpectedRest: nil,
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("POST"),
+			ExpectedResult: []byte("POST"),
+			ExpectedRest: nil,
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("PUT"),
+			ExpectedResult: []byte("PUT"),
+			ExpectedRest: nil,
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("TRACE"),
+			ExpectedResult: []byte("TRACE"),
+			ExpectedRest: nil,
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("/GET"),
+			ExpectedResult: []byte("/GET"),
+			ExpectedRest: nil,
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("/W"),
+			ExpectedResult: []byte("/W"),
+			ExpectedRest: nil,
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte(`()<>@,;:\"/[]?={}`),
+			ExpectedResult: []byte(`()<>@,;:\"/[]?={}`),
+			ExpectedRest: nil,
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("😈"),
+			ExpectedResult: []byte(`😈`),
+			ExpectedRest: nil,
+			ExpectedOK: true,
+		},
+
+
+
+		{
+			Value:          []byte("CONNECT "),
+			ExpectedResult: []byte("CONNECT"),
+			ExpectedRest:          []byte(" "),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("DELETE "),
+			ExpectedResult: []byte("DELETE"),
+			ExpectedRest:         []byte(" "),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("GET "),
+			ExpectedResult: []byte("GET"),
+			ExpectedRest:      []byte(" "),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("HEAD "),
+			ExpectedResult: []byte("HEAD"),
+			ExpectedRest:       []byte(" "),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("PATCH "),
+			ExpectedResult: []byte("PATCH"),
+			ExpectedRest:        []byte(" "),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("POST "),
+			ExpectedResult: []byte("POST"),
+			ExpectedRest:       []byte(" "),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("PUT "),
+			ExpectedResult: []byte("PUT"),
+			ExpectedRest:      []byte(" "),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("TRACE "),
+			ExpectedResult: []byte("TRACE"),
+			ExpectedRest:        []byte(" "),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("/GET "),
+			ExpectedResult: []byte("/GET"),
+			ExpectedRest:       []byte(" "),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("/W "),
+			ExpectedResult: []byte("/W"),
+			ExpectedRest:     []byte(" "),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte(`()<>@,;:\"/[]?={} `),
+			ExpectedResult: []byte(`()<>@,;:\"/[]?={}`),
+			ExpectedRest:                    []byte(` `),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("😈 "),
+			ExpectedResult: []byte(`😈`),
+			ExpectedRest:     []byte(" "),
+			ExpectedOK: true,
+		},
+
+
+
+		{
+			Value:          []byte("CONNECT\t"),
+			ExpectedResult: []byte("CONNECT"),
+			ExpectedRest:          []byte("\t"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("DELETE\t"),
+			ExpectedResult: []byte("DELETE"),
+			ExpectedRest:         []byte("\t"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("GET\t"),
+			ExpectedResult: []byte("GET"),
+			ExpectedRest:      []byte("\t"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("HEAD\t"),
+			ExpectedResult: []byte("HEAD"),
+			ExpectedRest:       []byte("\t"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("PATCH\t"),
+			ExpectedResult: []byte("PATCH"),
+			ExpectedRest:        []byte("\t"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("POST\t"),
+			ExpectedResult: []byte("POST"),
+			ExpectedRest:       []byte("\t"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("PUT\t"),
+			ExpectedResult: []byte("PUT"),
+			ExpectedRest:      []byte("\t"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("TRACE\t"),
+			ExpectedResult: []byte("TRACE"),
+			ExpectedRest:        []byte("\t"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("/GET\t"),
+			ExpectedResult: []byte("/GET"),
+			ExpectedRest:       []byte("\t"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("/W\t"),
+			ExpectedResult: []byte("/W"),
+			ExpectedRest:     []byte("\t"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte(`()<>@,;:\"/[]?={} `),
+			ExpectedResult: []byte(`()<>@,;:\"/[]?={}`),
+			ExpectedRest:                    []byte(` `),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("😈\t"),
+			ExpectedResult: []byte(`😈`),
+			ExpectedRest:     []byte("\t"),
+			ExpectedOK: true,
+		},
+
+
+
+		{
+			Value:          []byte("CONNECT\r"),
+			ExpectedResult: []byte("CONNECT"),
+			ExpectedRest:          []byte("\r"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("DELETE\r"),
+			ExpectedResult: []byte("DELETE"),
+			ExpectedRest:         []byte("\r"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("GET\r"),
+			ExpectedResult: []byte("GET"),
+			ExpectedRest:      []byte("\r"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("HEAD\r"),
+			ExpectedResult: []byte("HEAD"),
+			ExpectedRest:       []byte("\r"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("PATCH\r"),
+			ExpectedResult: []byte("PATCH"),
+			ExpectedRest:        []byte("\r"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("POST\r"),
+			ExpectedResult: []byte("POST"),
+			ExpectedRest:       []byte("\r"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("PUT\r"),
+			ExpectedResult: []byte("PUT"),
+			ExpectedRest:      []byte("\r"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("TRACE\r"),
+			ExpectedResult: []byte("TRACE"),
+			ExpectedRest:        []byte("\r"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("/GET\r"),
+			ExpectedResult: []byte("/GET"),
+			ExpectedRest:       []byte("\r"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("/W\r"),
+			ExpectedResult: []byte("/W"),
+			ExpectedRest:     []byte("\r"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte(`()<>@,;:\"/[]?={} `),
+			ExpectedResult: []byte(`()<>@,;:\"/[]?={}`),
+			ExpectedRest:                    []byte(` `),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("😈\r"),
+			ExpectedResult: []byte(`😈`),
+			ExpectedRest:     []byte("\r"),
+			ExpectedOK: true,
+		},
+
+
+
+		{
+			Value:          []byte("CONNECT\n"),
+			ExpectedResult: []byte("CONNECT"),
+			ExpectedRest:          []byte("\n"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("DELETE\n"),
+			ExpectedResult: []byte("DELETE"),
+			ExpectedRest:         []byte("\n"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("GET\n"),
+			ExpectedResult: []byte("GET"),
+			ExpectedRest:      []byte("\n"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("HEAD\n"),
+			ExpectedResult: []byte("HEAD"),
+			ExpectedRest:       []byte("\n"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("PATCH\n"),
+			ExpectedResult: []byte("PATCH"),
+			ExpectedRest:        []byte("\n"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("POST\n"),
+			ExpectedResult: []byte("POST"),
+			ExpectedRest:       []byte("\n"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("PUT\n"),
+			ExpectedResult: []byte("PUT"),
+			ExpectedRest:      []byte("\n"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("TRACE\n"),
+			ExpectedResult: []byte("TRACE"),
+			ExpectedRest:        []byte("\n"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("/GET\n"),
+			ExpectedResult: []byte("/GET"),
+			ExpectedRest:       []byte("\n"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("/W\n"),
+			ExpectedResult: []byte("/W"),
+			ExpectedRest:     []byte("\n"),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte(`()<>@,;:\"/[]?={} `),
+			ExpectedResult: []byte(`()<>@,;:\"/[]?={}`),
+			ExpectedRest:                    []byte(` `),
+			ExpectedOK: true,
+		},
+		{
+			Value:          []byte("😈\n"),
+			ExpectedResult: []byte(`😈`),
+			ExpectedRest:     []byte("\n"),
+			ExpectedOK: true,
+		},
+	}
+
+	for testNumber, test := range tests {
+
+		actualResult, actualRest, actualOK := method.BytesTolerant(test.Value)
+
+		{
+			expected := test.ExpectedOK
+			actual   := actualOK
+
+			if expected != actual {
+				t.Errorf("For test #%d, the actual ok-result is not what was expected." , testNumber)
+				t.Logf("EXPECTED: %t", expected)
+				t.Logf("ACTUAL:   %t", actual)
+				t.Logf("VALUE: %q (%#v)", test.Value, test.Value)
+				continue
+			}
+		}
+
+		{
+			expected := test.ExpectedResult
+			actual   := actualResult
+
+			if !bytes.Equal(expected, actual) {
+				t.Errorf("For test #%d, the actual result is not what was expected." , testNumber)
+				t.Logf("EXPECTED: %q (%#v)", expected, expected)
+				t.Logf("ACTUAL:   %q (%#v)", actual, actual)
+				t.Logf("VALUE: %q (%#v)", test.Value, test.Value)
+				continue
+			}
+		}
+
+		{
+			expected := test.ExpectedRest
+			actual   := actualRest
+
+			if !bytes.Equal(expected, actual) {
+				t.Errorf("For test #%d, the actual rest is not what was expected." , testNumber)
+				t.Logf("EXPECTED: %q (%#v)", expected, expected)
+				t.Logf("ACTUAL:   %q (%#v)", actual, actual)
+				t.Logf("VALUE: %q (%#v)", test.Value, test.Value)
+				continue
+			}
+		}
+	}
+}