for i, tt := range dumpTests {
		if tt.Req != nil && tt.GetReq != nil || tt.Req == nil && tt.GetReq == nil {
			t.Errorf("#%d: either .Req(%p) or .GetReq(%p) can be set/nil but not both", i, tt.Req, tt.GetReq)
			continue
		}

		freshReq := func(ti dumpTest) *http.Request {
			req := ti.Req
			if req == nil {
				req = ti.GetReq()
			}

			if req.Header == nil {
				req.Header = make(http.Header)

	frontendClient := frontend.Client()

	getReq, _ := http.NewRequest("GET", frontend.URL, nil)
	getReq.Host = "some-name"
	getReq.Header.Set("Connection", "close, TE")
	getReq.Header.Add("Te", "foo")
	getReq.Header.Add("Te", "bar, trailers")
	getReq.Header.Set("Proxy-Connection", "should be deleted")
	getReq.Header.Set("Upgrade", "foo")
	getReq.Close = true
	res, err := frontendClient.Do(getReq)
	if err != nil {

xe [1]
ye [2 3]
x [[1]]

			fmt.Println("x", x)
			if x.Equal(xe, ye) {
				fmt.Println("appending")
				z = append(z, xe)
				continue outer
			}
		}
	}
	return z
}

func SetEq[S []E, E comparable](x, y S) bool {
	fmt.Println("SetEq", x, y)
outer:
	for _, xe := range x {
		for _, ye := range y {
			if xe == ye {
				continue outer
			}
		}
		return false // xs wasn't found in y
	}
	return true

	ADDL	$4, SI
	ADDL	$4, DI
	SUBL	$4, BX
	CMPL	CX, DX
	JEQ	bigloop
	MOVB	$0, (AX)
	RET

	// remaining 0-4 bytes
leftover:
	MOVL	-4(SI)(BX*1), CX
	MOVL	-4(DI)(BX*1), DX
	CMPL	CX, DX
	SETEQ	(AX)
	RET

small:
	CMPL	BX, $0
	JEQ	equal

	LEAL	0(BX*8), CX
	NEGL	CX

	MOVL	SI, DX
	CMPB	DX, $0xfc
	JA	si_high

	// load at SI won't cross a page boundary.
	MOVL	(SI), SI

	MOVL	new+12(FP), CX
	LOCK
	CMPXCHGL	CX, 0(BX)
	SETEQ	ret+16(FP)
	RET

// bool	·Cas64(uint64 *val, uint64 old, uint64 new)
// Atomically:
//	if(*val == old){
//		*val = new;
//		return 1;
//	} else {
//		return 0;
//	}
TEXT ·Cas64(SB), NOSPLIT, $0-25
	MOVQ	ptr+0(FP), BX
	MOVQ	old+8(FP), AX
	MOVQ	new+16(FP), CX
	LOCK
	CMPXCHGQ	CX, 0(BX)
	SETEQ	ret+24(FP)
	RET

	ADDQ	$8, DI
	SUBQ	$8, BX
	CMPQ	CX, DX
	JEQ	bigloop
	XORQ	AX, AX	// return 0
	RET

	// remaining 0-8 bytes
leftover:
	MOVQ	-8(SI)(BX*1), CX
	MOVQ	-8(DI)(BX*1), DX
	CMPQ	CX, DX
	SETEQ	AX
	RET

small:
	CMPQ	BX, $0
	JEQ	equal

	LEAQ	0(BX*8), CX
	NEGQ	CX

	CMPB	SI, $0xf8
	JA	si_high

	// load at SI won't cross a page boundary.
	MOVQ	(SI), SI
	JMP	si_finish

	MOVL	new_hi+16(FP), CX
	LOCK
	CMPXCHG8B	0(BP)
	SETEQ	ret+20(FP)
	RET

// bool Casp1(void **p, void *old, void *new)
// Atomically:
//	if(*p == old){
//		*p = new;
//		return 1;
//	}else
//		return 0;
TEXT ·Casp1(SB), NOSPLIT, $0-13
	MOVL	ptr+0(FP), BX
	MOVL	old+4(FP), AX
	MOVL	new+8(FP), CX
	LOCK
	CMPXCHGL	CX, 0(BX)
	SETEQ	ret+12(FP)
	RET

// Absorb flag constants into SETxx ops.
((SETEQ|SETLE|SETGE|SETBE|SETAE) (FlagEQ))     => (MOVLconst [1])
((SETNE|SETL|SETG|SETB|SETA)     (FlagEQ))     => (MOVLconst [0])
((SETNE|SETL|SETLE|SETB|SETBE)   (FlagLT_ULT)) => (MOVLconst [1])
((SETEQ|SETG|SETGE|SETA|SETAE)   (FlagLT_ULT)) => (MOVLconst [0])
((SETNE|SETL|SETLE|SETA|SETAE)   (FlagLT_UGT)) => (MOVLconst [1])
((SETEQ|SETG|SETGE|SETB|SETBE)   (FlagLT_UGT)) => (MOVLconst [0])

	MOVL	BX, (AX)
	RET

	// all the bytes in common are the same, so we just need
	// to compare the lengths.
allsame:
	XORL	BX, BX
	XORL	CX, CX
	TESTL	DX, DX
	SETLT	BX	// 1 if alen > blen
	SETEQ	CX	// 1 if alen == blen
	LEAL	-1(CX)(BX*2), BX	// 1,0,-1 result
	MOVL	BX, (AX)