CURLOPT_STDERR是否始终执行

Question

好吧，我在向Discord API发出请求时遇到了问题，我不理解curl是如何工作的。

这是我的代码：

function make_request($mixed, $token, $get_json = true) {
$url = is_string($mixed) ? $mixed : getApiUrl($mixed);
// TODO: Check for valid url!
$log_file = __DIR__.'/../logs/request.txt';
if(!is_readable($log_file)) printError("File '$log_file' is not readable!");
if(!is_writable($log_file)) printError("File '$log_file' is not writable!");
$ch = curl_init();
$f = fopen($log_file, 'w+');
if($f === false) printError("There was an error opening '$log_file'!");
ftruncate($f, 0);
curl_setopt_array($ch, array(
CURLOPT_URL            => $url, 
CURLOPT_HTTPHEADER     => array('Authorization: Bot ' . $token), 
CURLOPT_RETURNTRANSFER => 1,
CURLOPT_FOLLOWLOCATION => 1,
CURLOPT_VERBOSE        => 1,
CURLOPT_SSL_VERIFYPEER => 0,
CURLOPT_STDERR         => $f,
));
$response = curl_exec($ch);
fclose($f);
curl_close($ch);
$contents = file_get_contents($log_file);
if($contents != '') 
{
// Censor bot key!
$contents = preg_replace("/^Authorization: Bot.+?$/", "Authorization: Bot xxx", $contents);
printError($contents);
}
if($get_json) {
$pretty = isset($_GET["pretty"]);
if($pretty) {
$json = json_decode($response);
return json_encode($json, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
}
return $response;
}
return json_decode($response, true);
}

这是我的输出：

[OuterException] System.Exception: * Hostname in DNS cache was stale, zapped
*   Trying 162.159.135.233...
* TCP_NODELAY set
* Connected to discordapp.com (162.159.135.233) port 443 (#0)
* ALPN, offering http/1.1
* Cipher selection: ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH
* successfully set certificate verify locations:
*   CAfile: /etc/ssl/certs/ca-certificates.crt
CApath: /etc/ssl/certs
* SSL connection using TLSv1.2 / ECDHE-ECDSA-AES128-GCM-SHA256
* ALPN, server accepted to use http/1.1
* Server certificate:
*  subject: CN=ssl711320.cloudflaressl.com
*  start date: Feb 13 00:00:00 2020 GMT
*  expire date: Aug 21 23:59:59 2020 GMT
*  subjectAltName: host "discordapp.com" matched cert's "discordapp.com"
*  issuer: C=GB; ST=Greater Manchester; L=Salford; O=COMODO CA Limited; CN=COMODO ECC Domain Validation Secure Server CA 2
*  SSL certificate verify ok.
> GET /api/guilds/479096180601782274 HTTP/1.1
Host: discordapp.com
Accept: */*
Authorization: Bot ...
< HTTP/1.1 200 OK
< Date: Thu, 20 Feb 2020 17:49:15 GMT
< Content-Type: application/json
< Transfer-Encoding: chunked
< Connection: keep-alive
< Set-Cookie: __cfduid=ddfc25d7448507e06474f24ff3e8352381582220955; expires=Sat, 21-Mar-20 17:49:15 GMT; path=/; domain=.discordapp.com; HttpOnly; SameSite=Lax
< Strict-Transport-Security: max-age=31536000; includeSubDomains
< Via: 1.1 google
< Alt-Svc: clear
< CF-Cache-Status: DYNAMIC
< Set-Cookie: __cfruid=66721d8d16cd42e4884dc62afe94705cbf1e21df-1582220955; path=/; domain=.discordapp.com; HttpOnly; Secure; SameSite=None
< Expect-CT: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
< Server: cloudflare
< CF-RAY: 568250ea9fe2a861-CDG
<
* Curl_http_done: called premature == 0
* Connection #0 to host discordapp.com left intact
en DiscordIdCrawler.Lib.Core.ApiWorker.CheckForErrors(Object response) en E:PHPdiscord-flooder-botclientDiscordIdCrawlerDiscordIdCrawler.LibCoreApiWorker.cs:línea 152
en DiscordIdCrawler.Lib.Core.ApiWorker.GetServerName(Int64 serverId) en E:PHPdiscord-flooder-botclientDiscordIdCrawlerDiscordIdCrawler.LibCoreApiWorker.cs:línea 312
en DiscordIdCrawler.Lib.Core.DriverWorker.GoToServer(IWebDriver web, Int32 serverNum, Boolean storeOnDB) en E:PHPdiscord-flooder-botclientDiscordIdCrawlerDiscordIdCrawler.LibCoreDriverWorker.cs:línea 141

我的问题是，当curl只是显示一个描述的日志时，我可能正在打印一个错误，但我不确定CURLOPT_STDERR是用来打印错误还是整个日志。

在文档上：https://www.php.net/manual/en/function.curl-setopt.php

将错误输出到的替代位置，而不是STDERR。

可能是因为启用了CURLOPT_VERBOSE。

TRUE以输出详细信息。将输出写入STDERR或使用CURLOPT_STDERR指定的文件。

在这种情况下，我需要知道何时发生错误。这里有小费吗？

Answer 1

你走在了正确的轨道上。如果您想要诊断输出，您必须安排在提出请求之前捕获。通常的方法是将其存储在RAM中，检查卷曲错误，并进行适当的处理。

这个代码看起来像：

$ch = curl_init();
curl_setopt_array($ch, [
// ... other options here
CURLOPT_RETURNTRANSFER => 1,
CURLOPT_VERBOSE => 1,
CURLOPT_STDERR => ($log = fopen('php://temp', 'w')),
]);
$response = curl_exec($ch);
if (false === $response) {
$errno = curl_error($ch);
$errmsg = curl_strerror($errno);
$logtext = stream_get_contents($log, -1, 0);
// ... log the info above, take action, etc.
} else {
// ... $response is your HTTP response
}
curl_close($ch);