I&#39;m hitting an API that will occasionally throw a HTTP 403 error, and the response body can give some extra information in the form of json, however for the life of me I can&#39;t seem to get the information back out from the Alamofire response objects.  I see the information in developer tools if I hit the API via chrome.  Here&#39;s my code:

    Alamofire.request(mutableURLRequest).validate().responseJSON() {
        (response) in
        switch response.result {
            case .Success(let data):
                if let jsonResult = data as? NSDictionary {
                    completion(jsonResult, error: nil)
                } else if let jsonArray = data as? NSArray {
                    let jsonResult = [&quot;array&quot; : jsonArray]
                    completion(jsonResult, error: nil)
                }
            case .Failure(let error):
                //error tells me 403
                //response.result.data can&#39;t be cast to NSDictionary or NSArray like
                //the successful cases, how do I get the response body?
        }

I&#39;ve queried pretty much every object attached to the response, but it doesn&#39;t seem to give me the response body back in the case of HTTP errors.  Is there a work-around or something I&#39;m missing here?

Any way to get the response body during HTTP errors?

I&#39;m trying to return a status code of 304 not modified for a GET method in a web api controller.

The only way I succeeded was something like this:

    public class TryController : ApiController
    {
        public User GetUser(int userId, DateTime lastModifiedAtClient)
        {
            var user = new DataEntities().Users.First(p =&gt; p.Id == userId);
            if (user.LastModified &lt;= lastModifiedAtClient)
            {
                 throw new HttpResponseException(HttpStatusCode.NotModified);
            }
            return user;
        }
    }

The problem here is that it&#39;s not an exception, It&#39;s just not modified so the client cache is OK.
I also want the return type to be a User (as all the web api examples shows with GET) not return HttpResponseMessage or something like this.

Returning http status code from Web Api controller

For returning from a Web API 2 controller, I can return content with the response if the response is OK (status 200) like this:

        public IHttpActionResult Get()
        {
            string myResult = ...
            return Ok(myResult);
        }

If possible, I want to use the built-in result types here when possible: https://msdn.microsoft.com/en-us/library/system.web.http.results(v=vs.118).aspx

My question is, for another type of response (not 200), how can I return a message (string) with it? For example, I can do this:

        public IHttpActionResult Get()
        {
           return InternalServerError();
        }

but not this:

        public IHttpActionResult Get()
        {
           return InternalServerError(&quot;Message describing the error here&quot;);
        }

Ideally I want this to be generalized so that I can send a message back with any of the implementations of IHttpActionResult.

Do I need to do this (and build my own response message):

        public IHttpActionResult Get()
        {
           HttpResponseMessage responseMessage = ...
           return ResponseMessage(responseMessage);
        }

or is there a better way?

Return content with IHttpActionResult for non-OK response

I read about _Pragma_ header on [Wikipedia](http://en.wikipedia.org/wiki/List_of_HTTP_header_fields) which says:

&gt; &quot;The Pragma: no-cache header field is an HTTP/1.0 header intended for
&gt; use in requests. It is a means for the browser to tell the server and
&gt; any intermediate caches that it wants a fresh version of the resource,
&gt; not for the server to tell the browser not to cache the resource. Some
&gt; user agents do pay attention to this header in responses, but the
&gt; HTTP/1.1 RFC specifically warns against relying on this behavior.&quot;

But I haven&#39;t understood what it does? What is the difference between the `Cache-Control` header whose value is `no-cache` and `Pragma` whose value is also `no-cache`?

Difference between Pragma and Cache-Control headers?

We&#39;re using Flask for one of our API&#39;s and I was just wondering if anyone knew how to return a HTTP response 201?

For errors such as 404 we can call:

    from flask import abort
    abort(404)

But for 201 I get

&gt; LookupError: no exception for 201

Do I need to create my own exception like [this][1] in the docs?


  [1]: http://werkzeug.pocoo.org/docs/exceptions/#custom-errors

Return HTTP status code 201 in flask

To my surprise, I can&#39;t do anything nearly as simple as this, from what I can tell, in the .NET BCL:

    byte[] response = Http.Post
    (
    	url: &quot;http://dork.com/service&quot;,
    	contentType: &quot;application/x-www-form-urlencoded&quot;,
    	contentLength: 32,
    	content: &quot;home=Cosby&amp;favorite+flavor=flies&quot;
    );

This hypothetical code above makes an HTTP POST, with data, and returns the response from a `Post` method on a static class `Http`.

Since we&#39;re left without something this easy, what&#39;s the next best solution?

How do I send an HTTP POST with data AND get the response&#39;s content?

.NET: Simplest way to send POST with data and read response

What does it mean when JavaScript network calls such as fetch or XMLHttpRequest, or any other type of HTTP network request, fail with an HTTP status code of 0?

This doesn&#39;t seem to be a valid HTTP status code as other codes are three digits in HTTP specification. 

I tried unplugging the network completely as a test. It may be unrelated, but that resulted in status code 17003 (IIRC), which cursory searching suggests means &quot;DNS server lookup failed&quot;.

The same code works fine from some locations and systems, however within certain environments it fails with status code 0 and there is no responseText provided.

This is a typical HTTP POST to an Internet URL. It does not involve file:// which I understand may return 0 indicating success in Firefox. 

What does it mean when an HTTP request returns status code 0?

I am trying to write some unit tests for my ApiController and faced some issues. There is a nice extension method called Request.CreateResponse that helps a lot with generating response. 

    public HttpResponseMessage Post(Product product)
    {
      var createdProduct = repo.Add(product);
      return this.Request.CreateResponse(HttpStatusCode.Created, createdProduct);
    }

Is there any way to mock CreateResponse without using of partial mocks or direct using of &quot;new HttpResponseMessage(...)&quot;?

ASP.NET WebApi unit testing with Request.CreateResponse

I am returning a stream in some response setting the appropriate `content-type` header. The behavior I&#39;m looking for is this:

- If the browser is able to render content of the given content type then it should display it in the browser window.

- If the browser doesn&#39;t know how to render the content, then it should display the &quot;save as&quot; dialog where the filename should be the one provided in the response.

The problem is that if I set the `Content-Disposition` header with:

&gt; &quot;attachment; filename=&quot;myfile.txt&quot;&quot;

the browser will always display the &quot;save as&quot; dialog.

If I don&#39;t set `Content-Disposition`, the filename used in the &quot;save as&quot; dialog is the one in the URL that doesn&#39;t work in my case.

I also tried setting `Content-Disposition` to `inline` but the outcome is the same.


How to set response filename without forcing &quot;save as&quot; dialog

I have written tests with Selenium2/WebDriver and want to test if HTTP Request returns an HTTP 403 Forbidden.

Is it possible to get the HTTP response status code with Selenium WebDriver?

How to get HTTP Response Code using Selenium WebDriver

I have found the following asp.net code to be very useful when serving files from a database:

    Response.AppendHeader(&quot;content-disposition&quot;, &quot;attachment; filename=&quot; + fileName);

This lets the user save the file to their computer and then decide how to use it, instead of the browser trying to use the file.

What other things can be done with the content-disposition response header?

Uses of content-disposition in an HTTP response header

So, one can attempt to fetch the following JSON object:

    $ curl -i -X GET http://echo.jsontest.com/key/value/anotherKey/anotherValue
    HTTP/1.1 200 OK
    Access-Control-Allow-Origin: *
    Content-Type: application/json; charset=ISO-8859-1
    Date: Wed, 30 Oct 2013 22:19:10 GMT
    Server: Google Frontend
    Cache-Control: private
    Alternate-Protocol: 80:quic,80:quic
    Transfer-Encoding: chunked
    
    {
       &quot;anotherKey&quot;: &quot;anotherValue&quot;,
       &quot;key&quot;: &quot;value&quot;
    }
    $

Is there a way to produce exactly the same body in a response from a server using node or express? Clearly, one can set the headers and indicate that the content-type of the response is going to be &quot;application/json&quot;, but then there are different ways to write/send the object. The one that I have seen commonly being used is by using a command of the form:

    response.write(JSON.stringify(anObject));

However, this has two points where one could argue as if they were &quot;problems&quot;:

 - We are sending a string.
 - Moreover, there is no new line character in the end.

Another idea is to use the command:

    response.send(anObject);

This appears to be sending a JSON object based on the output of curl similar to the first example above. However, there is no new line character in the end of the body when curl is again being used on a terminal. So, how can one actually write down something like this with a new line character appended in the end using node or node/express?

Proper way to return JSON using node or Express

I am returning a NotFound `IHttpActionResult`, when something is not found in my WebApi GET action. Along with this response, I want to send a custom message and/or the exception message (if any). The current `ApiController`&#39;s `NotFound()` method does not provide an overload to pass a message. 

Is there any way of doing this? or I will have to write my own custom `IHttpActionResult`?


How do I return NotFound() IHttpActionResult with an error message or exception?

Is it possible to create a Chrome extension that modifies HTTP response bodies?

I have looked in the [Chrome Extension APIs](https://developer.chrome.com/extensions/api_index), but I haven&#39;t found anything to do this.

Modify HTTP responses from a Chrome extension

I&#39;m using the `org.apache.http.HttpResponse` class in my Java application, and I need to be able to get the HTTP status code. If I used `.toString()` on it, I can see the HTTP status code in there. Is there any other function that I can just get the HTTP status code as either an int or String?

Thanks a bunch!

Get HTTP code from org.apache.http.HttpResponse

I want to force the browser to download a `pdf` file.

I am using the following code :

    &lt;a href=&quot;../doc/quot.pdf&quot; target=_blank&gt;Click here to Download quotation&lt;/a&gt;

It makes the browser open the pdf in a new window, but I want it to download to the hard drive when a user clicks it.

I found that `Content-disposition` is used for this, but how do I use it in my case?

How to Use Content-disposition for force a file to download to the hard drive?

What HTTP response headers are required to be sent from server to the client?

I working to optimize the HTTP response headers to minimize the HTTP response overhead. I know &quot;overhead&quot; is somewhat exaggerated, but I like a clean output.

I see a lot of websites, which sends redundant cache headers.

e.g.

It is redundant to specify both `Expires` and `Cache-Control: max-age`, or to specify both `Last-Modified` and `ETag`.

- [Source](http://code.google.com/intl/en/speed/page-speed/docs/caching.html#LeverageBrowserCaching)
- [HTTP/1.1: Header Field Definitions](www.w3.org/Protocols/rfc2616/rfc2616-sec6.html)

What HTTP response headers are required

By default, Tomcat sends some HTML content back to the client if it encounters something like an HTTP 404. I know that via `web.xml` an `&lt;error-page&gt;` [can be configured][1] to customize this content.

However, I&#39;d just like for Tomcat to **not send anything** in terms of response content (I&#39;d still like the status code, of course). Is there any way to easily configure this?

I&#39;m trying to avoid A) explicitly sending empty content on the response stream from my Servlet, and B) configuring custom error pages for a whole bunch of HTTP error statuses in my `web.xml`.

For some background, I&#39;m developing an HTTP API and am controlling my own response content. So for an HTTP 500, for example, I&#39;m populating some XML content on the response containing error information. For situations like an HTTP 404, the HTTP response status is sufficient for clients, and the content tomcat is sending is unnecessary. If there&#39;s a different approach, I&#39;m open to hearing it.

**Edit:**
After continued investigation, I still can&#39;t find much in the way of a solution. If someone can definitively say this is not possible, or provide a resource with evidence that it will not work, I&#39;ll accept that as an answer and try and work around it.

  [1]: http://wiki.apache.org/tomcat/FAQ/Miscellaneous#Q6

Disable all default HTTP error response content in Tomcat

I have been developing with WebApi and have moved on to WebApi2 where Microsoft has introduced a new `IHttpActionResult` Interface that seems to recommended to be used over returning a `HttpResponseMessage`. I am confused on the advantages of this new Interface. It seems to mainly just provide a **SLIGHTLY** easier way to create a `HttpResponseMessage`. 

I would make the argument that this is &quot;abstraction for the sake of abstraction&quot;. Am I missing something? What is the real world advantages I get from using this new Interface besides maybe saving a line of code?

**Old way** (WebApi):

    public HttpResponseMessage Delete(int id)
    {
        var status = _Repository.DeleteCustomer(id);
        if (status)
        {
            return new HttpResponseMessage(HttpStatusCode.OK);
        }
        else
        {
            throw new HttpResponseException(HttpStatusCode.NotFound);
        }
    }

**New Way** (WebApi2):

    public IHttpActionResult Delete(int id)
    {
        var status = _Repository.DeleteCustomer(id);
        if (status)
        {
            //return new HttpResponseMessage(HttpStatusCode.OK);
            return Ok();
        }
        else
        {
            //throw new HttpResponseException(HttpStatusCode.NotFound);
            return NotFound();
        }
    }

Why should I use IHttpActionResult instead of HttpResponseMessage?

I have created the following function for checking the connection status:

    private void checkConnectionStatus() {
        HttpClient httpClient = new DefaultHttpClient();

        try {
          String url = &quot;http://xxx.xxx.xxx.xxx:8000/GaitLink/&quot;
                       + strSessionString + &quot;/ConnectionStatus&quot;;
          Log.d(&quot;phobos&quot;, &quot;performing get &quot; + url);
          HttpGet method = new HttpGet(new URI(url));
          HttpResponse response = httpClient.execute(method);

          if (response != null) {
            String result = getResponse(response.getEntity());
            ...

When I shut down the server for testing the execution waits a long time at line

    HttpResponse response = httpClient.execute(method);

Does anyone know how to set the timeout in order to avoid waiting too long?

Thanks!


How to set HttpResponse timeout for Android in Java

I&#39;m making an HTTP call. My response contains a session code `X-BB-SESSION` in the header section of the `HttpResponseMessage` object. How do I get that specific header value?

I am using a foreach statement to iterate through all the headers ([MSDN link][1]). However the compiler keeps saying that it cannot be done: 

    foreach statement cannot operate on variables of type
      System.net.http.headers.cachecontrolheadervalue because
      &#39;System.net.http.headers.cachecontrolheadervalue&#39; doesn&#39;t contain
      a public definition for &#39;GetEnumerator&#39;

This is the code I&#39;m trying:

    //Connection code to BaasBox
    
    HttpResponseMessage response = await client.SendAsync(requestMessage, HttpCompletionOption.ResponseHeadersRead);
    if (response.IsSuccessStatusCode)
    {
        //get the headers
        HttpResponseHeaders responseHeadersCollection = response.Headers;
        foreach (var value in responseHeadersCollection.CacheControl)  --&gt; HERE
        {
            string sTemp = String.Format(&quot;CacheControl {0}={1}&quot;, value.Name, value.Value);
        } else
    {
        Console.WriteLine(&quot;X-BB-SESSION: NOT Found&quot;);
    }


The header content from where I&#39;m trying to get the value (`X-BB-SESSION` value) is something like:

    Access-Control-Allow-Origin: *    
    Access-Control-Allow-Headers: X-Requested-With    
    X-BB-SESSION: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

[1]: http://msdn.microsoft.com/en-us/library/windows/apps/windows.web.http.headers.httpresponseheadercollection.aspx


All Httpresponse Solutions on Gang of Coders

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