improve statusLine and StatusMessage by using slice instead of map

[kiyonlin]

We use slice instead of map to store all status messages and status lines. But for the status code bigger than statusMessageMax(511), it still should store them in the dynamic map(invalidStatusLines).

@erikdubbelboer PTAL

benchmarks result:
OLD:

BenchmarkStatusLine99
BenchmarkStatusLine99-8         278959663                4.51 ns/op            0 B/op          0 allocs/op
BenchmarkStatusLine99-8         262258332                4.83 ns/op            0 B/op          0 allocs/op
BenchmarkStatusLine99-8         257144448                4.73 ns/op            0 B/op          0 allocs/op
BenchmarkStatusLine99-8         251641419                4.80 ns/op            0 B/op          0 allocs/op
BenchmarkStatusLine200
BenchmarkStatusLine200-8        257207306                4.64 ns/op            0 B/op          0 allocs/op
BenchmarkStatusLine200-8        257618150                4.71 ns/op            0 B/op          0 allocs/op
BenchmarkStatusLine200-8        251996420                4.75 ns/op            0 B/op          0 allocs/op
BenchmarkStatusLine200-8        252930247                4.79 ns/op            0 B/op          0 allocs/op
BenchmarkStatusLine512
BenchmarkStatusLine512-8        222729294                5.49 ns/op            0 B/op          0 allocs/op
BenchmarkStatusLine512-8        218682082                5.43 ns/op            0 B/op          0 allocs/op
BenchmarkStatusLine512-8        218821902                5.48 ns/op            0 B/op          0 allocs/op
BenchmarkStatusLine512-8        219236438                5.62 ns/op            0 B/op          0 allocs/op

NEW:

BenchmarkStatusLine99
BenchmarkStatusLine99-8         545864635                2.22 ns/op            0 B/op          0 allocs/op
BenchmarkStatusLine99-8         517671476                2.33 ns/op            0 B/op          0 allocs/op
BenchmarkStatusLine99-8         505288328                2.31 ns/op            0 B/op          0 allocs/op
BenchmarkStatusLine99-8         505923718                2.36 ns/op            0 B/op          0 allocs/op
BenchmarkStatusLine200
BenchmarkStatusLine200-8        534919548                2.20 ns/op            0 B/op          0 allocs/op
BenchmarkStatusLine200-8        538629565                2.25 ns/op            0 B/op          0 allocs/op
BenchmarkStatusLine200-8        523182661                2.30 ns/op            0 B/op          0 allocs/op
BenchmarkStatusLine200-8        515232004                2.27 ns/op            0 B/op          0 allocs/op
BenchmarkStatusLine512
BenchmarkStatusLine512-8        223080207                5.42 ns/op            0 B/op          0 allocs/op
BenchmarkStatusLine512-8        222268503                5.39 ns/op            0 B/op          0 allocs/op
BenchmarkStatusLine512-8        216794157                5.47 ns/op            0 B/op          0 allocs/op
BenchmarkStatusLine512-8        216436990                5.57 ns/op            0 B/op          0 allocs/op

Co-authored-by: Fenny fenny@gofiber.io
Co-authored-by: ReneWerner87 rene@gofiber.io

[erikdubbelboer]

Thanks for the PR. I'm looking at this code now and to be honest I think we shouldn't keep invalid status codes in memory. Those shouldn't really happen often enough for this to be worth it (the memory and the code complexity). Can you make invalidStatusLine() just return the formatted line and remove invalidStatusLines? Thanks.

[erikdubbelboer]

Thanks!