From [Google&#39;s SPDY research project whitepaper][1]

&gt; Uncompressed request and response headers. Request headers today vary in size **from ~200 bytes to over 2KB**.  As applications use more cookies and user agents expand features, **typical header sizes of 700-800 bytes is common.**

  [1]: http://dev.chromium.org/spdy/spdy-whitepaper


The HTTP HEAD response from www.google.com is 823 bytes, as checked just now. This is without any authentication. About half of that is the Set-Cookie header. An easy way to check is the `curl` command.

I don&#39;t have any statistics to back this up (what does it mean to take a statistical average of HTTP header sizes? average over what?), but from anecdotal experience a typical HTTP header is 0.5KB and might go up to 1K or 2K (depending on cookie size, etc.). You could theoretically get HTTP headers up to 4K or 8K but that is fairly rare.

The size might vary based on what is presented by the web application, also we need to consider that a 200KB web page is not likely to be a solid 200KB. More likely it is 20KB of HTML, 30KB of Javascript/CSS and 150KB in 10 x 15KB images for a total of 12 requests perhaps. So the average request/response pair would NOT be 200KB but rather 17KB.

You welcome to check this tool for a basic idea : http://smallseotools.com/website-page-size-checker/

I&#39;m having difficulty finding a way to set a static field of a class. It&#39;s basically like this:

    public class Foo{
        // ...
        private static B b = null;
    }

where B is another class.

Is there any way to do this in PowerMock other than with `setInternalStateFromContext()`? Using the context class method seems a bit of overkill for setting one field.

Thanks.

PowerMock testing - set static field of class

Is it true that the UIWebViewDelegate does not monitor requests made by using a XMLHttpRequest? If so, is there a way to monitor these kind of requests?

e.g. UIWebViewDelegate does not catch this in `-(BOOL) webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSMutableURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType`;

    var xhr = new XMLHttpRequest();
    xhr.open(&quot;GET&quot;, &quot;http://www.google.com&quot;, true);
                 
    xhr.onreadystatechange=function() 
    {
        if (xhr.readyState==4) 
        {
            alert(xhr.responseText);
        }
    }
         
    xhr.send();

UIWebViewDelegate not monitoring XMLHttpRequest?

I am working with an embedded platform that has 16MB of RAM only. And I need to deep packet filter HTTP streams. To prevent a Denial of Service attack on the device I&#39;d like some statistical averages regarding HTTP stream sizes, specifically the HTTP header in particular.

What is the average size of an HTTP request/response header?

<p>I am working with an embedded platform that has 16MB of RAM only. And I need to deep packet filter HTTP streams. To prevent a Denial of Service attack on the device I'd like some statistical averages regarding HTTP stream sizes, specifically the HTTP header in particular.</p>


It is unclear to me when you should and should not return a HTTP 412: Precondition Failed, error for a web service?  I am thinking of using it when validating data.  For example, if a client POST&#39;s XML data and that data is missing a required data element, then responding with a 412 and a description of the error.

Does that align with the spirit of responding with an HTTP 412, or should something else be used (e.g. another http error code or web application exception)?

When is it appropriate to respond with a HTTP 412 error?

[w3fools][1] claims that URLs can contain spaces: http://w3fools.com/#html_urlencode

Is this true? How can a URL contain an un-encoded space?

I&#39;m under the impression the [request line of an HTTP Request][2] uses a space as a delimiter, being formatted as `{the method}{space}{the path}{space}{the protocol}`:

    GET /index.html http/1.1

Therefore how can a URL contain a space? If it can, where did the practice of replacing spaces with `+` come from?


  [1]: http://w3fools.com
  [2]: http://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol#Request_message

Spaces in URLs?

I&#39;m designing a public API to my company&#39;s data. We want application developers to sign up for an API key so that we can monitor use and overuse.

Since the API is REST, my initial thought is to put this key in a custom header. This is how I&#39;ve seen Google, Amazon, and Yahoo do it. My boss, on the other hand, thinks the API is easier to use if the key becomes merely a part of the URL, etc. &quot;http://api.domain.tld/longapikey1234/resource&quot;. I guess there is something to be said for that, but it violates the principle of the URL as a simple address of what you want, and not how or why you want it.

Would you find it logical to put the key in the URL? Or would you rather not have to manually set HTTP headers if writing a simple javascript frontend to some data?

Place API key in Headers or URL

I&#39;m implementing a REST service in PHP. This service should be able to support multiple input and output formats (JSON, XML). For that reason I want to check the request headers *&quot;Accept&quot;* and *&quot;Content-Type&quot;* for the type of content sent and requested by the client.

Accessing the *&quot;Accept&quot;* header is a simple as using `$_SERVER[&#39;HTTP_ACCEPT&#39;]`. But accessing the *&quot;Content-Type&quot;* header seems to be a difficult task. I searched the PHP documentation and the web, but the only solution offered was the use of the PHP function `apache_request_headers()` which is only supported when PHP is installed as an Apache module, which is not true in my case.

So my question now: How can I access the header &quot;Content-Type&quot; of a request?

Get &quot;Content-Type&quot; header of request in PHP

What does &quot;*Pending*&quot; mean under the status column in the &quot;*Network*&quot; tab of Google Chrome Developer window?

This happens when my page script issues a GET request whose response contains content-headers for downloading a CSV file:

    Content-type: text/csv;
    Content-Disposition: attachment; filename=myfile.csv

This works fine in FF and IE7, downloading a CSV file as expected and opening a file picker to save the file, but Chrome does nothing.  I confirmed that the server responds to the request, so it appears that Chrome will not process the response.

Curiously, all works as expected if I type the URL into Chromes address bar and hit &lt;enter&gt;.

FYI: Chrome 10.0.648.204 on Win-XP

What does &quot;pending&quot; mean for request in Chrome Developer Window?

I&#39;m using `Pattern`/`Matcher` to get the response code in an HTTP response. `groupCount` returns 1, but I get an exception when trying to get it! Any idea why?

Here&#39;s the code:

    //get response code
    String firstHeader = reader.readLine();
    Pattern responseCodePattern = Pattern.compile(&quot;^HTTP/1\\.1 (\\d+) OK$&quot;);
    System.out.println(firstHeader);
    System.out.println(responseCodePattern.matcher(firstHeader).matches());
    System.out.println(responseCodePattern.matcher(firstHeader).groupCount());
    System.out.println(responseCodePattern.matcher(firstHeader).group(0));
    System.out.println(responseCodePattern.matcher(firstHeader).group(1));
    responseCode = Integer.parseInt(responseCodePattern.matcher(firstHeader).group(1));

And here&#39;s the output:

    HTTP/1.1 200 OK
    true
    1
    Exception in thread &quot;Thread-0&quot; java.lang.IllegalStateException: No match found
	 at java.util.regex.Matcher.group(Unknown Source)
	 at cs236369.proxy.Response.&lt;init&gt;(Response.java:27)
	 at cs236369.proxy.ProxyServer.start(ProxyServer.java:71)
	 at tests.Hw3Tests$1.run(Hw3Tests.java:29)
	 at java.lang.Thread.run(Unknown Source)


&quot;No match Found&quot; when using matcher&#39;s group method

What’s the difference between `Expires` and `Cache-Control` headers?


what’s the difference between Expires and Cache-Control headers?

I&#39;m encountering a problem sending files stored in a database back to the user in ASP.NET MVC. What I want is a view listing two links, one to view the file and let the mimetype sent to the browser determine how it should be handled, and the other to force a download.

If I choose to view a file called `SomeRandomFile.bak` and the browser doesn&#39;t have an associated program to open files of this type, then I have no problem with it defaulting to the download behavior. However, if I choose to view a file called `SomeRandomFile.pdf` or `SomeRandomFile.jpg` I want the file to simply open. But I also want to keep a download link off to the side so that I can force a download prompt regardless of the file type. Does this make sense?

I have tried `FileStreamResult` and it works for most files, its constructor doesn&#39;t accept a filename by default, so unknown files are assigned a file name based on the URL (which does not know the extension to give based on content type). If I force the file name by specifying it, I lose the ability for the browser to open the file directly and I get a download prompt. Has anyone else encountered this?

These are the examples of what I&#39;ve tried so far.

    //Gives me a download prompt.
    return File(document.Data, document.ContentType, document.Name);
&lt;gap&gt;

    //Opens if it is a known extension type, downloads otherwise (download has bogus name and missing extension)
    return new FileStreamResult(new MemoryStream(document.Data), document.ContentType);
&lt;gap&gt;

    //Gives me a download prompt (lose the ability to open by default if known type)
    return new FileStreamResult(new MemoryStream(document.Data), document.ContentType) {FileDownloadName = document.Name};

Any suggestions?


----------


**UPDATE:**
This questions seems to strike a chord with a lot of people, so I thought I&#39;d post an update. The warning on the accepted answer below that was added by Oskar regarding international characters is completely valid, and I&#39;ve hit it a few times due to using the `ContentDisposition` class. I&#39;ve since updated my implementation to fix this. While the code below is from my most recent incarnation of this problem in an ASP.NET Core (Full Framework) app, it should work with minimal changes in an older MVC application as well since I&#39;m using the `System.Net.Http.Headers.ContentDispositionHeaderValue` class.

    using System.Net.Http.Headers;

    public IActionResult Download()
    {
    	Document document = ... //Obtain document from database context
    
    	//&quot;attachment&quot; means always prompt the user to download
        //&quot;inline&quot; means let the browser try and handle it
    	var cd = new ContentDispositionHeaderValue(&quot;attachment&quot;)
    	{
    		FileNameStar = document.FileName
    	};
    	Response.Headers.Add(HeaderNames.ContentDisposition, cd.ToString());
    
    	return File(document.Data, document.ContentType);
    }
    
    // an entity class for the document in my database 
    public class Document
    {
    	public string FileName { get; set; }
    	public string ContentType { get; set; }
        public byte[] Data { get; set; }
    	//Other properties left out for brevity
    }

Returning a file to View/Download in ASP.NET MVC

I am running a server on nodejs with express. I can&#39;t seem to get rid of the header:

    X-Powered-By:Express

I was wondering if there is any way to get rid of this header or do I have to live with it?

Content Type	Original Author	Original Content on Stackoverflow
Question	unixman83	View Question on Stackoverflow
Solution 1 - Http	typo.pl	View Answer on Stackoverflow
Solution 2 - Http	Aaron	View Answer on Stackoverflow
Solution 3 - Http	john	View Answer on Stackoverflow
Solution 4 - Http	Mickzo	View Answer on Stackoverflow

What is the average size of an HTTP request/response header?

Http Problem Overview

Http Solutions

Solution 1 - Http

Solution 2 - Http

Solution 3 - Http

Solution 4 - Http

UIWebViewDelegate not monitoring XMLHttpRequest?

PowerMock testing - set static field of class

Attributions