I am using django to build a simple website. When you type the base address (which for now is `127.0.0.1:8000/`), I use django to show a view which does some checks and redirects you based on your user privileges. (If you have admin privileges, you go to `/admin`, if you don&#39;t you go to `/home`, and if you aren&#39;t logged in you go to `/login`.)

When I make that HTTP request, I get redirected *as I should* but I also see the following two errors in my django log:

 1. code 400, message Bad request syntax `(&#39;\x16\x03\x01\x00\x95\x01\x00\x00\x91\x03\x01N\xaa\x9c\x08\x96\x7f\x92\xe9Z\x925\xcaY4\xa6\xa5\xab\xf2\x16\xfaT\x89\xe7\x8a\xc3\x99J)6\xfb\xc44\x00\x00H\xc0&#39;)`
 2. `&quot;??N????Z?5?Y4?????T??&#217;J)6??4H?&quot; 400 -`

I translated the hex in the first one to be (spaces added for legibility): `SYN ETX NUL NUL U SOH NUL NUL Q ETX NUL N 170 156 X r 246 STX 141 214 ? 143 EOT FS j 142 223 s 241 220 &lt; 185 \ \ m 242 &amp;`

I can certainly see why the server wouldn&#39;t like that as a request, but I have no idea where it&#39;s coming from.

Any ideas?

Thanks very much.

==============

Here is the code for the view:


    def index(request):
        user = request.user
        admin_courses = []

        if (user.is_authenticated()):
            u_id = user.getUserId()
            my_enrollment = Enrollment.objects.filter(user_id=u_id)
            admin_enrollment = my_enrollment.filter(type=&quot;ADMIN&quot;)
            for enr in admin_enrollment:
                course = Course.objects.get(id=enr.getCourseId())
                admin_courses.append(course)
            if (len(admin_courses)&gt;0):
                return HttpResponseRedirect(&#39;/admin&#39;)
            else:
                return HttpResponseRedirect(&#39;/home&#39;)
        return HttpResponseRedirect(&#39;/login&#39;)


Django: 400 bad request syntax - what does this message mean?

When sending notifications to iOS users, for some of them I get response status code 400 (BadDeviceToken) or code 410 (Unregistered).

From Apple documentation about &quot;BadDeviceToken&quot;:

&gt; The specified device token was bad. Verify that the request contains a valid token and that the token matches the environment.

What is the meaning of &quot;bad&quot;? I know for a fact that the device token was valid at some earlier time. What does a user do to make its device token bad? 

From documentation about &quot;Unregistered&quot;:

&gt; The device token is inactive for the specified topic.

Does this necceserally mean that the app has been deleted? Or there can be some other reasons for this response. 


What are the possible reasons to get APNs responses BadDeviceToken or Unregistered?

I read https://stackoverflow.com/questions/3050518/what-http-status-response-code-should-i-use-if-the-request-is-missing-a-required but it did not specifically ask about headers and there didn&#39;t seem to be a consensus.

The context of this question assumes successful authentication.  I&#39;m currently favoring either a 400 (though that doesn&#39;t feel right because this isn&#39;t really a case of &quot;malformed syntax&quot;) or 403.  Given 403&#39;s description:

&gt; The server understood the request, but is refusing to fulfill it.
&gt; Authorization will not help and the request SHOULD NOT be repeated. **If
&gt; the request method was not HEAD and the server wishes to make public
&gt; why the request has not been fulfilled, it SHOULD describe the reason
&gt; for the refusal in the entity.**

This makes the most sense to me.

Can someone please enlighten me?  Thanks.

What is the most appropriate HTTP status code to return if a required header is missing?

I&#39;m wondering if it is correct to return `HTTP 200 OK` when an error occurred on the server side (the error details would be contained inside the response body).

Example:

 1. We&#39;re sending `HTTP GET`
 2. Something unexpected happened on the server side.
 3. Server returns `HTTP 200 OK` status code with error inside a response (e.g. `{&quot;status&quot;:&quot;some error occurred&quot;}`)

Is this the correct behavior or not? Should we change the status code to something else than 200? 

Returning http 200 OK with error within response body

I have a JSON request which I&#39;m posting to a HTTP URL. 

Should this be treated as `400` where `requestedResource` field exists but `&quot;Roman&quot;` is an invalid value for this field? 

    [{requestedResource:&quot;Roman&quot;}] 

Should this be treated as `400` where `&quot;blah&quot;` field doesn&#39;t exist at all?

    [{blah:&quot;Roman&quot;}]

400 BAD request HTTP error code meaning?

The [HTTP/1.1 specification (RFC 2616)][1] has the following to say on the meaning of [status code 400, Bad Request (&#167;10.4.1)][2]:

&gt; The request could not be understood by
&gt; the server due to malformed syntax.
&gt; The client SHOULD NOT repeat the
&gt; request without modifications.

There seems to be a general practice among a few HTTP-based APIs these days to use 400 to mean a *logical* rather than a *syntax* error with a request. My guess is that APIs are doing this to distinguish between [400][3] (client-induced) and [500][4] (server-induced). Is it acceptable or incorrect to use 400 to indicate non-syntactic errors? If it is acceptable, is there an annotated reference on RFC 2616 that provides more insight into the intended use of 400?

Examples:

  * [Google Data Protocol, Protocol Reference, HTTP Status Codes][5]


  [1]: http://www.w3.org/Protocols/rfc2616/rfc2616.html
  [2]: http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.1
  [3]: http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.1
  [4]: http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.5.1
  [5]: http://code.google.com/apis/gdata/docs/2.0/reference.html#HTTPStatusCodes

HTTP 400 (bad request) for logical error, not malformed request syntax

I am trying to send an Ajax POST request using Jquery but I am having 400 bad request error.

Here is my code:

    $.ajax({
      type: &#39;POST&#39;,
      url: &quot;http://localhost:8080/project/server/rest/subjects&quot;,
      data: {
        &quot;subject:title&quot;:&quot;Test Name&quot;,
        &quot;subject:description&quot;:&quot;Creating test subject to check POST method API&quot;,
        &quot;sub:tags&quot;: [&quot;facebook:work&quot;, &quot;facebook:likes&quot;],
        &quot;sampleSize&quot; : 10,
        &quot;values&quot;: [&quot;science&quot;, &quot;machine-learning&quot;]
      },
      error: function(e) {
        console.log(e);
      }
    });

It Says: Can not build resource from request.
What am I missing ?

All Http Status-Code-400 Solutions on Gang of Coders