// vtest build: !sanitize-memory-clang
// Hermetic TLS-termination test for net.http.Server: spin up a local HTTPS
// server with an in-memory cert/key, hit it with http.fetch (validate: false),
// and assert the round-trip.

module main

import net
import net.http
import net.mbedtls
import time

const server_tls_cert = '-----BEGIN CERTIFICATE-----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\nMhj0zttiFHLAt9jGfyk6W57UNUja1e1ggftJJhs=\n-----END CERTIFICATE-----\n'

const server_tls_key = '-----BEGIN RSA PRIVATE KEY-----\nMIIJKQIBAAKCAgEAuoAjh+pSL5AFVZyxeCWi4t04wvn7DT7WFJHUp07RDlc91ACz\n/JhYn4pSQPAb76t/L0NQ+rsU1EFW6tdCRwC2fqBd2WUZRKPBSIOj83iYw7JL/ay5\n8G5p7DDuNWKumkf7PA/W1SeNF3qSGXpuLUhqf1VLOvcjL0KRciDUZTgI9eQ7J0t6\nhB96lfFagrU5Q3BPdUoL+y0B9jeP80gh6IliTK5EYUKTGf8FSM34CxeJO6BFxgoQ\nUd0g+Q64JelhuF/6UuxzOnEKzet1kb1v83qYQMLNdOZ4eSayN09N/7WTkNlm8rNU\nEGuB3EKAFvvlHCMXm/1aachzffBaB8kLoVpTOP01jFhRs8cP6NPPSskH+OPi7/Em\nUz97k1GZd1bvSk4wpe1aNFKiUs4Ug8otjWqzcoxMBnEopY8MMXtaUwnExG3ueeeS\nznLDjc2iDgKMMuTVmAROc+kuCjeNuYl0i/44cpMmsGVW8OrtVPKLEKhLkbwqg6bJ\nAmFpcbo3ATaJWEfkkgqDOAJ9618OyePGon+q2sVc9rwUXZOyiYPQ0r8ZmYhyz705\n5UHvkmfm6EV8sdJymJNu67nDc/8sj8yqKEtEHpFE2dHM8fx8iDltgL1vvvS1r/wZ\nwVG5gTy35REa2pcmggqLFsOWpXniRqXwVDNjOERN/340zopv+UoR8b+myW8CAwEA\nAQKCAgEAkcoffF0JOBMOiHlAJhrNtSiX+ZruzNDlCxlgshUjyWEbfQG7sWbqSHUZ\njZflTrqyZqDpyca7Jp2ZM2Vocxa0klIMayfj08trCaOWY3pPeROE4d3HUJMPjEpH\nvEXTFdnVJIOBPgl3+vWfBfm17QIh9j4X3BVbVNNl3WCaiDGAl699Kl+Pe38cFeCh\nD3JZPEWsZ5SlvwjU8sNGbThjAWN8C1NjMuCXG4hGej5Ae3M/nPPR91jgnw4Me4Ut\nIL3K3RVyGqaqAPJjLsu0kWQUArJAGMfvUkXjwVklkaUV5SHtJBs+pdTXjyprTmJR\nvSXWWON5zkAEEJNY7QcZaeKYi96PFLUFI+ciEdnXn74CfSKhgZCBo+OyFZjDWW5R\nNmgAbZTN2RW0z+V54Lg36JfJrmiGs8TN06KwNjFo+iOJCdQnoUSIhTlmMfVbXPah\ntRfQvwqtfqVS9W/jkiGq9yDDqyXx093R/QTM/XqDlWJ2iOJFppOJefGFCWF6Fwll\nVT9povTAGQmXFiAxwFZxWtbFa0i8fP5QG80X6l/gRklSd6ZXAVvcLkaFGqxunDAe\nrYC2jBwHWRpVmbxw880SWRzlAsJXc7M8PQnBTlyX1mFZNnwAJgqplz0BQHQhQh4V\nqNfisUm9smtda+Hr9GBBUxs09ulery3I0lQjsArVxPqPVgUbFPECggEBANqLA5fH\n2LupOBoFH/fK5jixyGdSB8eJvU+XuS8RBBexnzTQApmDHiU7Axa/cKvxAfUgwBpU\n6OIsL6Lq6wowVInBgo7GraACwspGMIP8Z7+A8qDgSWIcpXP21Ny2RW+nukdH8ZnV\nTFtiFxLYU9GRfzSUcqvE0miKfMGP/S9Cqbew00K6CQ2xurLTR2AchfUQZJJIg7eF\nRBoftthXLQ+s1JoiLJX2gqCliFy32RMAUP+pKvKVJmVQh8bxEkoEzTV2eY7eTxsH\nJDH5hD66EZ5bW/nVAMruJ3iKjy3WvjDbnddNAz9IFKrd1RMP9dgSEKuSv/HhqwPe\n1q9Wm6LWZo8BlYcCggEBANp3M14QMcMxRlZE0TiSopi1CaE8OG0C9apToS1dol2s\n4lCsWHVPIC516LMPGU0bmCdtwJey1mgXQEKVxCWHkVhhoCKT/tN53o5qkptrhrXL\npbqmRfoMXI7LwJU+Vqi5fwSPGrSR/IzHwCUL7pHTbYN7wT5rr2rcC84XYSX31TFm\nNfMnbDuUk33ycAo07Vqts5A5FN+xViEUMFSDmfA2XmOAV77awz0l/3n3qOg9lQYe\nU4Av2nT19lGELirLInkB1ndLirWAcLaCBXKOLW4bzpNm9Bt8aiziVzcUzlJlLa+1\nnb/7//xzKi0eM/BhyJfhsmOz5B8AQ6Ca/keDk8M7JtkCggEARl8DDinE6VCpBv/l\ndlX4YgMlQ9fPN3pr4ig58iTpi3Ofj1L3s1TcLSLecMG+Vy9o8PTVxuTWhJWz1SMO\nAh7j6ePM1Yq2N9MLxDRrxOROyASOnCz8lEIjKL8vdc6fdz+sJO3OpzleuAJS6beM\n7euK6XRvpE3hbtZBK9bgsQonOkYPEOp0pds4AgM0dYdZvzrDF7OP7lVUQ5E4wFr5\n4JVHdEZS0wsoru/+g9STaqHscxaXBLvwPCl9Pxs7R2haZ7+5jr6Y/FwFVK5C3ivu\nJm7GpCDpe27KeO8tAZancXYWUlCzHfpo5Ug/Jz85a5UNlyHO+uUuuzVTLeyWew3M\nwnnBGwKCAQEAqGTBP3wUH3TX1p9s9cJxemvxZEra44woeIXF8wX9pV8hgzWVabb4\nA1f3ai31Pq5KdfnvPf8nrUxex/RRIOyCaDG4EW8qOS/zEKutHgef6nly4ZBQ2BC3\nN4pug5ttiNiSw5za5NyyYoGF5ghweA8UlwjJR6gRqri6kL0MsQt7VXyHkUmN787y\ncV5yZiut2PuTMVQOdu5miVDagAqAmdwOnXvMJtzRKU0kw4rWs0zklbbCfkhkh0sf\n9m2AeJPjmoqEGags3wKF3ugR8t8MvZbJgG0XNCiOXtKIj3iGIJTExm+jjNxd0OWk\nWOqy9lMpH4lky91ZtVuqxR0za0RMnWv24QKCAQBe8l0w9AYVNGDLv1jyPcbsncty\nNYI81yqe2mL+TC00sMCeil7C7WCP7kRklY01rH5q5gJ9Q1UV+bOj2fQdXDmQ5Bgo\n41jseh44gkbuXAeWcSDrDkJCrfvlNqFobTmUb8cdb9aQlHYfOJ31367LJspiw2SY\nmCbnLQ5sMnyBiMkcn0GfBV6IAkZVN73DPa8a1m/0Qrrv1GmBJFVbuZd9d/hAWpHa\nekhXPq0Sta+RNDfBR3aI5lAmVA17qRGiubQYJ+Ldq0aRJ40fGE51ctoSU/5RMcmh\n6+Qro+jSC94L46xMFp+1J5atgB1p/jVzTT/Ws7SLyotYUSL8zU7tcLiycQXs\n-----END RSA PRIVATE KEY-----\n'

struct EchoHandler {
mut:
    last_path string
}

fn (mut h EchoHandler) handle(req http.Request) http.Response {
    h.last_path = req.url
    return http.Response{
        status_code: 200
        body:        'tls hello ${req.url}'
    }
}

struct BlockingHandler {
    started chan bool
    release chan bool
}

fn testsuite_end() {
    http.close_idle_connections()
}

fn (mut h BlockingHandler) handle(req http.Request) http.Response {
    h.started <- true
    _ := <-h.release
    return http.Response{
        status_code: 200
        header:      http.new_header(key: .connection, value: 'close')
        body:        'released'
    }
}

fn pick_port() !int {
    mut l := net.listen_tcp(.ip, '127.0.0.1:0')!
    port := l.addr()!.port()!
    l.close()!
    return port
}

fn test_server_tls_round_trip() {
    $if use_openssl ? {
        // TLS termination for net.http.Server is not yet supported on the
        // OpenSSL backend; the listener stub reports a clear runtime error and
        // the test is skipped here so the suite stays green under
        // `-d use_openssl`.
        eprintln('skipping: TLS server not implemented for -d use_openssl yet')
        return
    }
    port := pick_port() or {
        assert false, 'pick_port: ${err}'
        return
    }
    mut srv := &http.Server{
        addr:                   '127.0.0.1:${port}'
        cert:                   server_tls_cert
        cert_key:               server_tls_key
        in_memory_verification: true
        accept_timeout:         time.second
        handler:                EchoHandler{}
        show_startup_message:   false
    }
    t := spawn srv.listen_and_serve()
    srv.wait_till_running() or {
        srv.close()
        t.wait()
        assert false, 'server failed to start: ${err}'
        return
    }
    defer {
        srv.close()
        t.wait()
    }
    // Give the listener a beat to come up.
    time.sleep(50 * time.millisecond)

    resp := http.fetch(
        url:      'https://127.0.0.1:${port}/hello'
        validate: false
    ) or {
        assert false, 'fetch failed: ${err}'
        return
    }
    assert resp.status_code == 200
    assert resp.body == 'tls hello /hello'
}

fn test_server_tls_stop() {
    $if use_openssl ? {
        eprintln('skipping: TLS server not implemented for -d use_openssl yet')
        return
    }
    port := pick_port() or {
        assert false, 'pick_port: ${err}'
        return
    }
    mut srv := &http.Server{
        addr:                   '127.0.0.1:${port}'
        cert:                   server_tls_cert
        cert_key:               server_tls_key
        in_memory_verification: true
        accept_timeout:         100 * time.millisecond
        handler:                EchoHandler{}
        show_startup_message:   false
    }
    t := spawn srv.listen_and_serve()
    srv.wait_till_running() or {
        srv.close()
        t.wait()
        assert false, 'server failed to start: ${err}'
        return
    }
    srv.stop()
    assert srv.status() == .stopped
    t.wait()
    assert srv.status() == .closed
}

fn test_server_tls_close_caps_default_accept_poll() {
    $if use_openssl ? {
        eprintln('skipping: TLS server not implemented for -d use_openssl yet')
        return
    }
    port := pick_port() or {
        assert false, 'pick_port: ${err}'
        return
    }
    mut srv := &http.Server{
        addr:                   '127.0.0.1:${port}'
        cert:                   server_tls_cert
        cert_key:               server_tls_key
        in_memory_verification: true
        handler:                EchoHandler{}
        show_startup_message:   false
    }
    t := spawn srv.listen_and_serve()
    srv.wait_till_running() or {
        srv.close()
        t.wait()
        assert false, 'server failed to start: ${err}'
        return
    }
    sw := time.new_stopwatch()
    srv.close()
    t.wait()
    assert sw.elapsed() < time.second
    assert srv.status() == .closed
}

fn test_server_tls_close_waits_for_active_request() {
    $if use_openssl ? {
        eprintln('skipping: TLS server not implemented for -d use_openssl yet')
        return
    }
    port := pick_port() or {
        assert false, 'pick_port: ${err}'
        return
    }
    started := chan bool{cap: 1}
    release := chan bool{cap: 1}
    done := chan string{cap: 1}
    mut srv := &http.Server{
        addr:                   '127.0.0.1:${port}'
        cert:                   server_tls_cert
        cert_key:               server_tls_key
        in_memory_verification: true
        accept_timeout:         time.second
        handler:                BlockingHandler{
            started: started
            release: release
        }
        show_startup_message:   false
    }
    t := spawn srv.listen_and_serve()
    srv.wait_till_running() or {
        srv.close()
        t.wait()
        assert false, 'server failed to start: ${err}'
        return
    }
    spawn fn [done, port] () {
        resp := http.fetch(
            url:          'https://127.0.0.1:${port}/blocked'
            enable_http2: false
            validate:     false
        ) or {
            done <- 'error: ${err}'
            return
        }
        done <- resp.body
    }()
    select {
        _ := <-started {}
        msg := <-done {
            srv.close()
            t.wait()
            assert false, 'client finished before handler started: ${msg}'
            return
        }
        2 * time.second {
            srv.close()
            t.wait()
            assert false, 'timed out waiting for handler to start'
            return
        }
    }
    srv.close()
    time.sleep(50 * time.millisecond)
    release <- true
    assert (<-done) == 'released'
    t.wait()
    assert srv.status() == .closed
}

fn test_server_tls_close_during_silent_handshake() {
    $if use_openssl ? {
        eprintln('skipping: TLS server not implemented for -d use_openssl yet')
        return
    }
    port := pick_port() or {
        assert false, 'pick_port: ${err}'
        return
    }
    mut srv := &http.Server{
        addr:                   '127.0.0.1:${port}'
        cert:                   server_tls_cert
        cert_key:               server_tls_key
        in_memory_verification: true
        accept_timeout:         100 * time.millisecond
        handler:                EchoHandler{}
        show_startup_message:   false
    }
    t := spawn srv.listen_and_serve()
    srv.wait_till_running() or {
        srv.close()
        t.wait()
        assert false, 'server failed to start: ${err}'
        return
    }
    mut client := net.dial_tcp('127.0.0.1:${port}') or {
        srv.close()
        t.wait()
        assert false, 'tcp dial failed: ${err}'
        return
    }
    defer {
        client.close() or {}
    }
    time.sleep(50 * time.millisecond)
    sw := time.new_stopwatch()
    srv.close()
    t.wait()
    assert sw.elapsed() < time.second
    assert srv.status() == .closed
}

// test_server_tls_close_under_handshake_flood guards the case where every worker
// is stuck in a slow TLS handshake AND the channel buffer is full of untracked
// raw conns, so the accept thread parks on `ch <- conn`. If the accept thread
// could not poll s.state during that send it would never reach close_idle(), and
// close() would hang until a worker handshake timed out. Each client sends a
// valid ClientHello then stalls, so the server's handshake blocks waiting for the
// client's next flight (a bare connect would instead fail the handshake fast and
// free the worker). With one worker and a one-slot buffer this fills: conn 0 ->
// the worker, conn 1 -> the buffer, conn 2 -> the blocked send.
fn test_server_tls_close_under_handshake_flood() {
    $if use_openssl ? {
        eprintln('skipping: TLS server not implemented for -d use_openssl yet')
        return
    }
    port := pick_port() or {
        assert false, 'pick_port: ${err}'
        return
    }
    // A real 165-byte TLS 1.2 ClientHello captured from V's own mbedtls client.
    // The exact bytes (random/session id) are irrelevant; the server only needs a
    // structurally valid first flight to start the handshake and then block
    // waiting for the client's ClientKeyExchange, which never arrives.
    client_hello := [u8(0x16), 0x03, 0x03, 0x00, 0xa0, 0x01, 0x00, 0x00, 0x9c, 0x03, 0x03, 0x6a,
        0x3d, 0x34, 0x4c, 0x8f, 0x46, 0x64, 0xd8, 0xe9, 0x2d, 0x46, 0x16, 0xd3, 0xf2, 0x87, 0xe4,
        0xee, 0xc5, 0x57, 0x6c, 0x8e, 0xd7, 0x36, 0x19, 0x3b, 0x35, 0x7a, 0x01, 0x03, 0xde, 0x6e,
        0x64, 0x00, 0x00, 0x24, 0xc0, 0x2c, 0xc0, 0x2b, 0xc0, 0x30, 0xc0, 0x2f, 0xc0, 0x24, 0xc0,
        0x23, 0xc0, 0x28, 0xc0, 0x27, 0xc0, 0x0a, 0xc0, 0x09, 0xc0, 0x14, 0xc0, 0x13, 0x00, 0x9d,
        0x00, 0x9c, 0x00, 0x3d, 0x00, 0x3c, 0x00, 0x35, 0x00, 0x2f, 0x01, 0x00, 0x00, 0x4f, 0x00,
        0x0a, 0x00, 0x08, 0x00, 0x06, 0x00, 0x1d, 0x00, 0x17, 0x00, 0x18, 0x00, 0x0b, 0x00, 0x02,
        0x01, 0x00, 0x00, 0x0d, 0x00, 0x1a, 0x00, 0x18, 0x08, 0x04, 0x08, 0x05, 0x08, 0x06, 0x04,
        0x01, 0x05, 0x01, 0x02, 0x01, 0x04, 0x03, 0x05, 0x03, 0x02, 0x03, 0x02, 0x02, 0x06, 0x01,
        0x06, 0x03, 0x00, 0x23, 0x00, 0x00, 0x00, 0x10, 0x00, 0x0e, 0x00, 0x0c, 0x02, 0x68, 0x32,
        0x08, 0x68, 0x74, 0x74, 0x70, 0x2f, 0x31, 0x2e, 0x31, 0x00, 0x17, 0x00, 0x00, 0xff, 0x01,
        0x00, 0x01, 0x00]
    mut srv := &http.Server{
        addr:                   '127.0.0.1:${port}'
        cert:                   server_tls_cert
        cert_key:               server_tls_key
        in_memory_verification: true
        // A finite accept_timeout doubles as the handshake budget (see
        // tls_accept_timeouts), so use a large one: each stalled handshake must
        // stay stuck long enough to keep the worker busy and form the wedge,
        // rather than time out in milliseconds. The accept loop still polls at the
        // 100ms tls_accept_poll_timeout cap regardless.
        accept_timeout:       8 * time.second
        worker_num:           1
        pool_channel_slots:   1
        handler:              EchoHandler{}
        show_startup_message: false
    }
    t := spawn srv.listen_and_serve()
    srv.wait_till_running() or {
        srv.close()
        t.wait()
        assert false, 'server failed to start: ${err}'
        return
    }
    mut clients := []&net.TcpConn{}
    for _ in 0 .. 4 {
        mut c := net.dial_tcp('127.0.0.1:${port}') or { continue }
        c.write(client_hello) or {}
        clients << c
    }
    defer {
        for mut c in clients {
            c.close() or {}
        }
    }
    // Let the accept thread occupy the worker and buffer and park on the send.
    time.sleep(400 * time.millisecond)
    sw := time.new_stopwatch()
    srv.close()
    t.wait()
    // close_idle() force-closes the stuck handshake fds, so close() returns well
    // before the 8s handshake timeout — but only if the accept thread escaped the
    // blocked send to reach it.
    assert sw.elapsed() < 2 * time.second
    assert srv.status() == .closed
}

fn test_server_tls_close_interrupts_idle_keep_alive() {
    $if use_openssl ? {
        eprintln('skipping: TLS server not implemented for -d use_openssl yet')
        return
    }
    port := pick_port() or {
        assert false, 'pick_port: ${err}'
        return
    }
    mut srv := &http.Server{
        addr:                   '127.0.0.1:${port}'
        cert:                   server_tls_cert
        cert_key:               server_tls_key
        in_memory_verification: true
        accept_timeout:         time.second
        read_timeout:           5 * time.second
        handler:                EchoHandler{}
        show_startup_message:   false
    }
    t := spawn srv.listen_and_serve()
    srv.wait_till_running() or {
        srv.close()
        t.wait()
        assert false, 'server failed to start: ${err}'
        return
    }
    mut client := mbedtls.new_ssl_conn(mbedtls.SSLConnectConfig{}) or {
        srv.close()
        t.wait()
        assert false, 'ssl client init failed: ${err}'
        return
    }
    defer {
        client.shutdown() or {}
    }
    client.dial('127.0.0.1', port) or {
        srv.close()
        t.wait()
        assert false, 'ssl dial failed: ${err}'
        return
    }
    request := 'GET /idle HTTP/1.1\r\nHost: 127.0.0.1:${port}\r\nConnection: keep-alive\r\n\r\n'
    client.write_string(request) or {
        srv.close()
        t.wait()
        assert false, 'ssl write failed: ${err}'
        return
    }
    mut buf := []u8{len: 4096}
    n := client.read(mut buf) or {
        srv.close()
        t.wait()
        assert false, 'ssl read failed: ${err}'
        return
    }
    response := buf[..n].bytestr()
    assert response.to_lower().contains('connection: keep-alive')
    assert response.contains('tls hello /idle')

    sw := time.new_stopwatch()
    srv.close()
    t.wait()
    assert sw.elapsed() < 2 * time.second
    assert srv.status() == .closed
}

fn test_server_tls_close_interrupts_idle_h2() {
    $if use_openssl ? {
        eprintln('skipping: TLS server not implemented for -d use_openssl yet')
        return
    }
    port := pick_port() or {
        assert false, 'pick_port: ${err}'
        return
    }
    mut srv := &http.Server{
        addr:                   '127.0.0.1:${port}'
        cert:                   server_tls_cert
        cert_key:               server_tls_key
        in_memory_verification: true
        accept_timeout:         time.second
        read_timeout:           5 * time.second
        enable_http2:           true
        handler:                EchoHandler{}
        show_startup_message:   false
    }
    t := spawn srv.listen_and_serve()
    srv.wait_till_running() or {
        srv.close()
        t.wait()
        assert false, 'server failed to start: ${err}'
        return
    }
    mut client := mbedtls.new_ssl_conn(mbedtls.SSLConnectConfig{
        alpn_protocols: ['h2']
    }) or {
        srv.close()
        t.wait()
        assert false, 'ssl client init failed: ${err}'
        return
    }
    defer {
        client.shutdown() or {}
    }
    client.dial('127.0.0.1', port) or {
        srv.close()
        t.wait()
        assert false, 'ssl dial failed: ${err}'
        return
    }
    assert client.negotiated_alpn() == 'h2'
    mut h2 := http.new_h2_conn(client)
    resp := h2.do(http.H2ClientRequest{
        method:    'GET'
        scheme:    'https'
        authority: '127.0.0.1:${port}'
        path:      '/h2-idle'
    }) or {
        srv.close()
        t.wait()
        assert false, 'h2 request failed: ${err}'
        return
    }
    assert resp.status == 200
    assert resp.body.bytestr() == 'tls hello /h2-idle'

    sw := time.new_stopwatch()
    srv.close()
    t.wait()
    assert sw.elapsed() < 2 * time.second
    assert srv.status() == .closed
}

fn test_server_tls_close_interrupts_incomplete_h2_request() {
    $if use_openssl ? {
        eprintln('skipping: TLS server not implemented for -d use_openssl yet')
        return
    }
    port := pick_port() or {
        assert false, 'pick_port: ${err}'
        return
    }
    mut srv := &http.Server{
        addr:                   '127.0.0.1:${port}'
        cert:                   server_tls_cert
        cert_key:               server_tls_key
        in_memory_verification: true
        accept_timeout:         time.second
        read_timeout:           2 * time.second
        enable_http2:           true
        handler:                EchoHandler{}
        show_startup_message:   false
    }
    t := spawn srv.listen_and_serve()
    srv.wait_till_running() or {
        srv.close()
        t.wait()
        assert false, 'server failed to start: ${err}'
        return
    }
    mut client := mbedtls.new_ssl_conn(mbedtls.SSLConnectConfig{
        alpn_protocols: ['h2']
    }) or {
        srv.close()
        t.wait()
        assert false, 'ssl client init failed: ${err}'
        return
    }
    defer {
        client.shutdown() or {}
    }
    client.dial('127.0.0.1', port) or {
        srv.close()
        t.wait()
        assert false, 'ssl dial failed: ${err}'
        return
    }
    assert client.negotiated_alpn() == 'h2'
    mut enc := http.H2HpackEncoder{}
    block := enc.encode([
        http.H2HeaderField{':method', 'POST'},
        http.H2HeaderField{':scheme', 'https'},
        http.H2HeaderField{':authority', '127.0.0.1:${port}'},
        http.H2HeaderField{':path', '/h2-incomplete'},
    ])
    mut out := []u8{}
    out << http.h2_client_preface.bytes()
    out << http.H2Frame(http.H2SettingsFrame{}).encode()
    out << http.H2Frame(http.H2HeadersFrame{
        stream_id:   1
        fragment:    block
        end_headers: true
        end_stream:  false
    }).encode()
    written := client.write(out) or {
        srv.close()
        t.wait()
        assert false, 'ssl write failed: ${err}'
        return
    }
    assert written == out.len
    time.sleep(100 * time.millisecond)

    sw := time.new_stopwatch()
    srv.close()
    t.wait()
    assert sw.elapsed() < time.second
    assert srv.status() == .closed
}

fn test_server_tls_parallel_handshakes() {
    $if use_openssl ? {
        eprintln('skipping: TLS server not implemented for -d use_openssl yet')
        return
    }
    port := pick_port() or {
        assert false, 'pick_port: ${err}'
        return
    }
    mut srv := &http.Server{
        addr:                   '127.0.0.1:${port}'
        cert:                   server_tls_cert
        cert_key:               server_tls_key
        in_memory_verification: true
        accept_timeout:         time.second
        handler:                EchoHandler{}
        show_startup_message:   false
    }
    t := spawn srv.listen_and_serve()
    srv.wait_till_running() or {
        srv.close()
        t.wait()
        assert false, 'server failed to start: ${err}'
        return
    }
    defer {
        srv.close()
        t.wait()
    }
    time.sleep(50 * time.millisecond)

    // Fire many clients at once. Handshakes now run on the worker pool, so they
    // proceed concurrently against the listener's shared mbedtls config/RNG (safe
    // because MBEDTLS_THREADING_C is enabled on all platforms). Assert every
    // round-trip succeeds with the correct body — a thread-safety regression in
    // the shared handshake state would surface as a failed/garbled response.
    n := 16
    results := chan string{cap: n}
    for i in 0 .. n {
        spawn fn [results, port, i] () {
            resp := http.fetch(
                url:          'https://127.0.0.1:${port}/p${i}'
                enable_http2: false
                validate:     false
            ) or {
                results <- 'error: ${err}'
                return
            }
            if resp.status_code != 200 {
                results <- 'bad status: ${resp.status_code}'
                return
            }
            results <- resp.body
        }()
    }
    // Results arrive in nondeterministic order, so match on the common prefix
    // rather than a specific path index.
    mut ok := 0
    for _ in 0 .. n {
        body := <-results
        assert body.starts_with('tls hello /p'), 'unexpected response: ${body}'
        ok++
    }
    assert ok == n, 'expected ${n} successful concurrent handshakes, got ${ok}'
}

fn test_server_tls_h2_negotiation() {
    $if use_openssl ? {
        eprintln('skipping: TLS server not implemented for -d use_openssl yet')
        return
    }
    port := pick_port() or {
        assert false, 'pick_port: ${err}'
        return
    }
    mut srv := &http.Server{
        addr:                   '127.0.0.1:${port}'
        cert:                   server_tls_cert
        cert_key:               server_tls_key
        in_memory_verification: true
        accept_timeout:         time.second
        enable_http2:           true
        handler:                EchoHandler{}
        show_startup_message:   false
    }
    t := spawn srv.listen_and_serve()
    srv.wait_till_running() or {
        srv.close()
        t.wait()
        assert false, 'server failed to start: ${err}'
        return
    }
    defer {
        srv.close()
        t.wait()
    }
    time.sleep(50 * time.millisecond)

    // Client opts into HTTP/2; server must select `h2` via ALPN and serve the
    // request through its HTTP/2 driver.
    resp := http.fetch(
        url:          'https://127.0.0.1:${port}/h2'
        enable_http2: true
        validate:     false
    ) or {
        assert false, 'h2 fetch failed: ${err}'
        return
    }
    assert resp.version() == .v2_0
    assert resp.status_code == 200
    assert resp.body == 'tls hello /h2'

    // With HTTP/2 disabled on the client, the server must keep speaking
    // HTTP/1.1 to the same listener. (enable_http2 defaults to true since
    // vlang/v#27384, so it must be opted out of explicitly here.)
    resp_h1 := http.fetch(
        url:          'https://127.0.0.1:${port}/h1'
        enable_http2: false
        validate:     false
    ) or {
        assert false, 'h1 fetch failed: ${err}'
        return
    }
    assert resp_h1.version() == .v1_1
    assert resp_h1.status_code == 200
}