What’s wrong with this HTTP POST request

httphttp-headersjsonrequest

I'm trying to fuzz a server using the Sulley fuzzing framework.

I observe the following stream in Wireshark.
The error talks about a problem with JSON parsing, however, when I try the same HTTP POST request using Google Chrome's Postman extension, it succeeds.

Can anyone please explain what could be wrong about this HTTP POST request? The JSON seems valid.

POST /restconf/config HTTP/1.1
Host: 127.0.0.1:8080
Accept: */*
Content-Type: application/yang.data+json
{ "toaster:toaster" : { "toaster:toasterManufacturer" : "Geqq", "toaster:toasterModelNumber" : "asaxc", "toaster:toasterStatus" : "_." }}


HTTP/1.1 400 Bad Request
Server: Apache-Coyote/1.1
Content-Type: */*
Transfer-Encoding: chunked
Date: Sat, 07 Jun 2014 05:26:35 GMT
Connection: close

152
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<errors xmlns="urn:ietf:params:xml:ns:yang:ietf-restconf">
    <error>
        <error-type>protocol</error-type>
        <error-tag>malformed-message</error-tag>
        <error-message>Error parsing input: Root element of Json has to be Object</error-message>
    </error>
</errors>

0

Best Answer

It was the "Content-Length" property that was missing in the header and the server thought it was mandatory, which I suppose shouldn't be mandatory?

After adding the "Content-Length" to the header, works like a charm.

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