使用UrlFetchApp的POST请求返回404，其中等效的curl成功

我有一个很长的curl请求，我想使用UrlFetchApp:来模拟它

curl 'https://example.com/index.php' -H 'Cookie: "XXXXXXXXXX"' -H 'Origin: https://example.com' -H 'Accept-Encoding: gzip, deflate' -H 'Accept-Language: en-US,en;q=0.8' -H 'User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.101 Safari/537.36' -H 'Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryK0ckVcd9Rae277Ae' -H 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8' -H 'Cache-Control: max-age=0' -H 'Referer: https://example.com/index.php' -H 'Connection: keep-alive' --data-binary $'------WebKitFormBoundaryK0ckVcd9Rae277Ae'r'nContent-Disposition: form-data; name="user"'r'n'r'nstaff'r'n------WebKitFormBoundaryK0ckVcd9Rae277Ae'r'nContent-Disposition: form-data; name="name"'r'n'r'nJohn Smith'r'n------WebKitFormBoundaryK0ckVcd9Rae277Ae'r'nContent-Disposition: form-data; name="staffid"'r'n'r'ne00000'r'n------WebKitFormBoundaryK0ckVcd9Rae277Ae'r'nContent-Disposition: form-data; name="preferred"'r'n'r'nEmail'r'n------WebKitFormBoundaryK0ckVcd9Rae277Ae'r'nContent-Disposition: form-data; name="phone"'r'n'r'n9999 9999'r'n------WebKitFormBoundaryK0ckVcd9Rae277Ae'r'nContent-Disposition: form-data; name="altemail"'r'n'r'njohn.smith@example.com'r'n------WebKitFormBoundaryK0ckVcd9Rae277Ae'r'nContent-Disposition: form-data; name="subject"'r'n'r'nother'r'n------WebKitFormBoundaryK0ckVcd9Rae277Ae'r'nContent-Disposition: form-data; name="desc"'r'n'r'nTEST ONLY.'r'n------WebKitFormBoundaryK0ckVcd9Rae277Ae'r'nContent-Disposition: form-data; name="userfield"'r'n'r'n'r'n------WebKitFormBoundaryK0ckVcd9Rae277Ae'r'nContent-Disposition: form-data; name="timezone"'r'n'r'nMon Mar 23 2015 10:28:33 GMT+1100 (AEDT)'r'n------WebKitFormBoundaryK0ckVcd9Rae277Ae'r'nContent-Disposition: form-data; name="browserstring"'r'n'r'nMozilla/5.0 (Macintosh; Intel Mac OS X 10_10_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.101 Safari/537.36'r'n------WebKitFormBoundaryK0ckVcd9Rae277Ae'r'nContent-Disposition: form-data; name="files[]"; filename=""'r'nContent-Type: application/octet-stream'r'n'r'n'r'n------WebKitFormBoundaryK0ckVcd9Rae277Ae--'r'n' --compressed

我使用以下UrlFetchApp代码，它只创建一个有效载荷和一个头对象，并将有效载荷编码为二进制blob：

function sendHttpPost(mailBody) {
   var reqPayload = '------WebKitFormBoundaryTIE5gBodnUrDhzC9'r'nContent-Disposition: form-data; name="rmituser"'r'n'r'nstaff'r'n' + 
     '------WebKitFormBoundaryTIE5gBodnUrDhzC9'r'nContent-Disposition: form-data; name="name"'r'n'r'nJohn Smith'r'n' + 
     '------WebKitFormBoundaryTIE5gBodnUrDhzC9'r'nContent-Disposition: form-data; name="staffid"'r'n'r'nE00000'r'n' + 
     '------WebKitFormBoundaryTIE5gBodnUrDhzC9'r'nContent-Disposition: form-data; name="phone"'r'n'r'n9999 9999'r'n' + 
     '------WebKitFormBoundaryTIE5gBodnUrDhzC9'r'nContent-Disposition: form-data; name="altemail"'r'n'r'n'r'n' + 
     '------WebKitFormBoundaryTIE5gBodnUrDhzC9'r'nContent-Disposition: form-data; name="subject"'r'n'r'nother'r'n' + 
     '------WebKitFormBoundaryTIE5gBodnUrDhzC9'r'nContent-Disposition: form-data; name="desc"'r'n'r'nTEST ONLY.'r'n' + 
     '------WebKitFormBoundaryTIE5gBodnUrDhzC9'r'nContent-Disposition: form-data; name="userfield"'r'n'r'n'r'n' + 
     '------WebKitFormBoundaryTIE5gBodnUrDhzC9'r'nContent-Disposition: form-data; name="timezone"'r'n'r'nThu Mar 19 2015 16:25:47 GMT+1100 (AEDT)'r'n' + 
     '------WebKitFormBoundaryTIE5gBodnUrDhzC9'r'nContent-Disposition: form-data; name="browserstring"'r'n'r'nMozilla/5.0 (Macintosh; Intel Mac OS X 10_10_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.89 Safari/537.36'r'n' + 
     '------WebKitFormBoundaryTIE5gBodnUrDhzC9'r'nContent-Disposition: form-data; name="files[]"; filename=""'r'nContent-Type: application/octet-stream'r'n'r'n'r'n' + 
     '------WebKitFormBoundaryTIE5gBodnUrDhzC9--'r'n';

  var reqHeaders = {
    'Cookie' : 'XXXXXXXXXXXXXXX',
    'Origin' : 'https://example.com',
    'Accept-Encoding' : 'gzip, deflate',
    'Accept-Language' : 'en-US,en;q=0.8',
    'User-Agent' : 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.101 Safari/537.36',
    'Content-Type' : 'multipart/form-data; boundary=----WebKitFormBoundaryK0ckVcd9Rae277Ae',
    'Accept' : 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
    'Cache-Control' : 'max-age=0',
    'Referer' : 'https://example.com/index.php',
    'Connection' : 'keep-alive' 
  };

  var blob = Utilities.newBlob(reqPayload);
  var options =
   {
     'method' : 'post',
     'payload' : blob.getBytes(),
     'headers' : reqHeaders,
     'muteHttpExceptions' : true
   };
   var response = UrlFetchApp.fetch("https://www.example.com/index.php", options); 
     Logger.log("Response Full: " + response);
 }

虽然我修改了一些细节以匿名化示例（包括删除cookie细节），但这两个请求应该是相同的。curl请求是有效的，而UrlFetchApp请求是基于从curl请求的复制构建的。但是UrlFetchApp请求返回404。

我很想知道我是否遗漏了什么显而易见的东西。