I am attempting to send a POST request from an embedded device to my webserver, yet the webserver returns error 400 to me.
This is the request I am sending to port 80 of my server:
POST /api_back.php HTTP/1.1
Host: mysubdomain.mydomain.com
User-Agent: AppleWebKit/531.21.10
Accept: */*
Content-Type: application/x-www-form-urlencoded
Cache-Control: no-cache
Accept-Charset: utf-8, us-ascii
Pragma: no-cache
data=10,1,1,1,1,-48%0D%0A10,1,1,1,1,-48%0D%0A10,1,1,1,1,-47%0D%0A10,1,1,1,1,-48%0D%0A10,1,1,1,1,-48%0D%0A10,1,1,1,1,-47%0D%0A10,1,1,1,1,-47%0D%0A
Then I get the following reply:
http/1.1 400 bad request
date: sun, 08 jan 2017 16:59:54 gmt
server: apache/2.4.23 (unix) openssl/1.0.1e-fips mod_bwlimited/1.4
accept-ranges: bytes
connection: close
content-type: text/html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>400 Bad Request</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css">
body {
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 12px;
background-color:#367E8E;
scrollbar-base-color: #005B70;
scrollbar-arrow-color: #F3960B;
scrollbar-DarkShadow-Color: #000000;
color: #FFFFFF;
margin:0;
}
a { color:#021f25; text-decoration:none}
h1 {
font-size: 18px;
color: #FB9802;
padding-bottom: 10px;
background-image: url(sys_cpanel/images/bottombody.jpg);
background-repeat: repeat-x;
padding:5px 0 10px 15px;
margin:0;
}
#body-content p {
padding-left: 25px;
padding-right: 25px;
line-height: 18px;
padding-top: 5px;
padding-bottom: 5px;
}
h2 {
font-size: 14px;
font-weight: bold;
color: #FF9900;
padding-left: 15px;
}
</style>
</head>
<body>
<div id="body-content">
<!-- start content-->
<!--
instead of REQUEST_URI, we could show absolute URL via:
http://HTTP_HOST/REQUEST_URI
but what if its https:// or other protocol?
SERVER_PORT_SECURE doesn't seem to be used
SERVER_PORT logic would break if they use alternate ports
-->
<h1>400 Bad Request</h1>
<p>Your browser sent a request that this server could not understand:</p>
<blockquote>
(none) (port 80)
</blockquote>
<p>
Please forward this error screen to 31.186.174.155's
<a href="mailto:[email protected]?subject=Error message [400] 400 Bad Request for (none) port 80 on Sunday, 08-Jan-2017 17:59:54 CET">
WebMaster</a>.
</p>
<hr />
<!-- end content -->
</div>
</body>
</html>The error seems to suggest the host name or request uri is wrong, so I also tried the whole URL in the POST link this:
POST http://mysubdomain.mydomain.com/api_back.php HTTP/1.1
Host: mysubdomain.mydomain.com
...
No luck with this either. Other things I tried
- Different user agents
- HTTP/1.0
- No subdomain in host header
All of them seem to result in the same error.
Anyone a suggestion? Am I missing a header? Is there an error in the headers?
Any help or suggestions are much appreciated!
Regards, Robert
For those of you looking for a similar issue; the problem was that a comma apparently is not a valid character in a post request, urlencode the comma and life's all good again :)