我正在尝试通过HTTP POST消息将图像从IP安全摄像机发送到Web服务器。尽管文件传输似乎正确完成，但是全局$ _FILES和$ _POST数组仍然为空。
服务器：适用于OS X 5.6.39，Apache 2.4.37的XAMPP
客户端：MOBOTIX IP凸轮（基于Linux，带有经过修改的软件包）
请注意，我无法控制客户端代码，因为我们正在谈论的是嵌入式系统，该系统已被制造商锁定，最重要的是，用于发送请求的二进制文件很可能是完全不是标准的（针对主机系统修改并重新编译了源代码）。
为解决此问题，我用更标准的工具（例如cURL）替换了IP摄像机，并且一切正常。
$ curl -v "http://localhost/test/test.php" -F "file=@pic.jpg"
这是预期的结果：
<pre>
POST dump:
array(0) {
}
FILES dump:
array(1) {
["file"]=>
array(5) {
["name"]=>
string(11) "pic.jpg"
["type"]=>
string(10) "image/jpeg"
["tmp_name"]=>
string(45) "/Applications/XAMPP/xamppfiles/temp/phpz8TOrR"
["error"]=>
int(0)
["size"]=>
int(11706)
}
}
</pre>
因此，我认为我的页面或Web服务器没有问题，但我想弄清楚是什么原因阻止了$ _FILES数组的填充。
这是我的PHP页面的代码：
<?php
sleep(2);
if ($_SERVER["REQUEST_METHOD"] == "POST") {
if (!empty($_POST) || !empty($_FILES)) {
echo "<pre>\nPOST dump:\n";
var_dump($_POST);
echo "FILES dump:\n";
var_dump($_FILES);
//print_r($_FILES);
echo "</pre>\n";
exit();
} else {
echo "Empty POST\n";
exit();
}
} else {
echo "Only POST requests allowed\n";
exit();
}
?>
在IP摄像机上执行Wireshark跟踪的结果如下：
POST /test/test.php HTTP/1.0
Host: 192.168.1.100:80
User-Agent: mxmsg/2.2 (mx10-9-151-2; 10.9.151.2; MX-V4.4.1.55)
Accept: */ *
Content-Type: multipart/form-data; boundary="mxmsg_qswteervteuliaodpj9a7b5i3_20050405"
--mxmsg_qswteervteuliaodpj9a7b5i3_20050405
Content-Disposition: form-data; name="file"; filename="/tmp2/clipdir21301/E00000.jpg"
Content-Type: image/jpeg
Content-Length: 9256
<IMAGE DATA, less than 10 KB>
--mxmsg_qswteervteuliaodpj9a7b5i3_20050405--
HTTP/1.1 200 OK
Date: Fri, 17 May 2019 12:27:12 GMT
Server: Apache/2.4.37 (Unix) OpenSSL/1.0.2q PHP/5.6.39 mod_perl/2.0.8-dev Perl/v5.16.3
X-Powered-By: PHP/5.6.39
Content-Length: 11
Connection: close
Content-Type: text/html; charset=UTF-8
Empty POST
通过相机日志收到的其他信息：
INF: loading notify profile...
INF: set profile address "192.168.1.100:80"
INF: set profile http version: "HTTP/1.0"
INF: set profile http cgi path: "/test/test.php"
INF: set profile http authorize: ""
INF: using 'now' for base time
INF: add file '/tmp2/clipdir21301/E00000.jpg' to list
INF: [hdl#1] connection established (ip=192.168.1.100, port=80, fd=2) ...
INF: reached data limit of 512 bytes ... (stop reading)
INF: [hdl#1] HTTP-Headers: HTTP/1.1 200 OK
INF: [hdl#1] HTTP-Headers: Date: Fri, 17 May 2019 07:28:20 GMT
INF: [hdl#1] HTTP-Headers: Server: Apache/2.4.37 (Unix) OpenSSL/1.0.2q PHP/5.6.39 mod_perl/2.0.8-dev Perl/v5.16.3
INF: [hdl#1] HTTP-Headers: X-Powered-By: PHP/5.6.39
INF: [hdl#1] HTTP-Headers: Content-Length: 53
INF: [hdl#1] HTTP-Headers: Connection: close
INF: [hdl#1] HTTP-Headers: Content-Type: text/html; charset=UTF-8
INF: notification to 192.168.1.100:80 has been sent [msg okay=1].
INF: Server 192.168.1.100:80 response HTTP code 200.
Result:
INF: sending message succeed. 1x9256 bytes in 2.877s.
对cURL请求执行的Wireshark跟踪的结果：
POST /test/test.php HTTP/1.1
Host: 192.168.1.100
User-Agent: curl/7.64.1
Accept: */ *
Content-Length: 9486
Content-Type: multipart/form-data; boundary=------------------------7aa5e6b4427813b7
Expect: 100-continue
HTTP/1.1 100 Continue
--------------------------7aa5e6b4427813b7
Content-Disposition: form-data; name="file"; filename="pic.jpg"
Content-Type: image/jpeg
<IMAGE DATA, less than 10KB>
--------------------------7aa5e6b4427813b7--
HTTP/1.1 200 OK
Date: Fri, 17 May 2019 12:32:03 GMT
Server: Apache/2.4.37 (Unix) OpenSSL/1.0.2q PHP/5.6.39 mod_perl/2.0.8-dev Perl/v5.16.3
X-Powered-By: PHP/5.6.39
Content-Length: 323
Content-Type: text/html; charset=UTF-8
<pre>
POST dump:
array(0) {
}
<pre>
FILES dump:
array(1) {
["file"]=>
array(5) {
["name"]=>
string(11) "pic.jpg"
["type"]=>
string(10) "image/jpeg"
["tmp_name"]=>
string(45) "/Applications/XAMPP/xamppfiles/temp/phptisqiC"
["error"]=>
int(0)
["size"]=>
int(9297)
}
}
</pre>
任何提示将不胜感激！
[编辑]
我在另一台服务器（带有PHP 5.3的IIS 10）上进行了另一项测试；我使用了完全相同的PHP代码，但在这种情况下，服务器返回了411 Length Required错误消息，我认为这与照相机声明内容长度的方式有关。
POST /test/test.php HTTP/1.0
Host: 192.168.1.100:80
User-Agent: mxmsg/2.2 (mx10-9-151-2; 10.9.151.2; MX-V4.4.1.55)
Accept: */ *
Content-Type: multipart/form-data; boundary="mxmsg_qswteervteuliaodpj9a7b5i3_20050405"
--mxmsg_qswteervteuliaodpj9a7b5i3_20050405
Content-Disposition: form-data; name="file"; filename="/tmp2/clipdir21301/E00000.jpg"
Content-Type: image/jpeg
Content-Length: 9256
<IMAGE DATA, less than 10 KB>
--mxmsg_qswteervteuliaodpj9a7b5i3_20050405--
HTTP/1.1 411 Length Required
Content-Type: text/html; charset=us-ascii
Server: Microsoft-HTTPAPI/2.0
Date: Thu, 23 May 2019 09:22:32 GMT
Connection: close
Content-Length: 344
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN""http://www.w3.org/TR/html4/strict.dtd">
<HTML><HEAD><TITLE>Length Required</TITLE>
<META HTTP-EQUIV="Content-Type" Content="text/html; charset=us-ascii"></HEAD>
<BODY><h2>Length Required</h2>
<hr><p>HTTP Error 411. The request must be chunked or have a content length.</p>
</BODY></HTML>
根据RFC 2616，第4.4章消息长度...
如果请求包含消息正文，但Content-Length不包含 给定的情况下，服务器不能响应400（错误请求） 确定消息的长度，如果有则确定为411（需要长度） 它希望坚持接收有效的Content-Length。
...，并且上面报告的调试信息清楚地表明，相机包括附加图像的长度，但不是整个请求中的一个。现在的问题是：为什么XAMPP（Apache）返回200 OK，而ISS返回411 Length Required？