&gt; is this URL format safe to use for all
&gt; browsers.

I can&#39;t say anything for sure, but you should be able to test it in different browsers.

&gt; And is it a standard?

Technically, it is called &quot;network path reference&quot; according to [RFC 3986][1]. Here is the scheme for it:

      relative-ref  = relative-part [ &quot;?&quot; query ] [ &quot;#&quot; fragment ]

      relative-part = &quot;//&quot; authority path-abempty
                    / path-absolute
                    / path-noscheme
                    / path-empty

---

There is a problem though, when used on a `&lt;link&gt;` or `@import`, IE7 and IE8 download the file.

Here is a post written by Paul Irish on the subject:

 - [The protocol-relative URL][2]


  [1]: https://www.rfc-editor.org/rfc/rfc3986#section-4.2
  [2]: http://paulirish.com/2010/the-protocol-relative-url/

Yes I believe it is. Paul Irish coined the term [Protocol Relative URL][1].

I&#39;d also point out it&#39;s part of the [HTML5Boilerplate][2] project which evangelises cross browser compatibility.

**Note:** there is an edge case in IE6 with google analytics which is mentioned in Paul&#39;s article. So it&#39;s not perfect.


  [1]: http://paulirish.com/2010/the-protocol-relative-url/
  [2]: http://html5boilerplate.com

Should be safe.

Is specified as format to use in Google&#39;s HTML/CSS styleguide: EDIT: latest url : https://google.github.io/styleguide/htmlcssguide.xml#Protocol

Or, a more general question would be, how to slice an array to get every n-th line, so for even/odd you&#39;d want to skip one line, but in the general case you&#39;d want to get every n-th lines, skipping n-1 lines.

Shortest way to slice even/odd lines from a python array?

Can any one please make me clear what is the difference between **virtual memory** and **swap space**?

And why do we say that for a 32-bit machine the maximum virtual memory accessible is 4 GB only?

What&#39;s the difference between &quot;virtual memory&quot; and &quot;swap space&quot;?

I saw the `//somepage.com/resource` url format. For example:

    &lt;img src=&quot;//remotesite.com/image1.jpg&quot; /&gt;

The point of this is that if the current page (the page defining the `img` tag) is using `http`, then the request to the remote site is made via http. If it is https - it&#39;s https. This eliminates browser warnings of not fully encrypted pages.

My question is - is this URL format safe to use for all browsers. And is it a standard?

Absolute URLs omitting the protocol (scheme) in order to preserve the one of the current page

I saw the <code>//somepage.com/resource</code> url format. For example:
<pre><code class="hljs language-ini">&#x3C;img src="//remotesite.com/image1.jpg" />
</code></pre>
The point of this is that if the current page (the page defining the <code>img</code> tag) is using <code>http</code>, then the request to the remote site is made via http. If it is https - it's https. This eliminates browser warnings of not fully encrypted pages.
My question is - is this URL format safe to use for all browsers. And is it a standard?

I had been racking my brains over creating a vertical alignment in css using the following

&lt;!-- begin snippet: js hide: false console: true babel: false --&gt;

&lt;!-- language: lang-css --&gt;

    .base{
            background-color:green;
    	    width:200px;
    	    height:200px;
    	    overflow:auto;
    	    position:relative;
    	}

        .vert-align{
    		padding-top:50%;
    		height:50%;
    	}

&lt;!-- language: lang-html --&gt;

    &lt;!-- and used the following div structure. --&gt;

        &lt;div class=&quot;base&quot;&gt;
           &lt;div class=&quot;vert-align&quot;&gt;
        	   Content Here
           &lt;/div&gt;
        &lt;/div&gt;

&lt;!-- end snippet --&gt;

While this seemed to work for this case, i was surprised that when i increased or decreased the width of my base div, the vertical alignment would snap. I was expecting that when I set the padding-top property, it would take the padding as a percentage of the height of the parent container, which is base in our case, but the above value of 50 percent is calculated as a percentage of the width. :(

Is there a way to set the padding and/or margin as a percentage of the height, without resorting to using JavaScript? 

How to set the margin or padding as percentage of height of parent container?

I thought this would be rather simple but it seems the empty method is not working to clear out a tbody that I have. I would appreciate if anyone knows a proper way to do this, I just want to delete everything contained within the tbody. So far I am trying:

    $(&quot;#tbodyid&quot;).empty();

HTML:

    &lt;table&gt;
    &lt;tbody id=&quot;tbodyid&quot;&gt;
    &lt;tr&gt;&lt;td&gt;something&lt;/td&gt;&lt;/tr&gt;
    &lt;/tbody&gt;
    &lt;/table&gt;

NOTE: I am trying to do this to integrate with a plugin written by someone else that I am being made to use for a project. I am generating new `&lt;tr&gt;&lt;td&gt;new data&lt;/td&gt;&lt;/tr&gt;` server-side and want to just be able to wipe out the existing table rows and replace them on AJAX callbacks.


Jquery, Clear / Empty all contents of tbody element?

What are the differences between SVG and HTML5 Canvas? They both seem to do the same to me. Basically, they both draw vector artwork using coordinate points.

What am I missing? What are the major differences between SVG and HTML5 Canvas? Why should I choose one over the other?

What is the difference between SVG and HTML5 Canvas?

I have 1 form in with multiple checkboxes in it (each with the code):

    &lt;input type=&quot;checkbox&quot; name=&quot;check_list&quot; value=&quot;&lt;? echo $row[&#39;Report ID&#39;] ?&gt;&quot;&gt;

Where `$row[&#39;Report ID&#39;]` is a primary key in a database -so each value is different.

How would I be able to tell which checkboxes have been checked? (Maybe multiple)

This is for an inbox system and I have a button below that I want (when clicked) to delete all messages (ids of: `$row[&#39;Report ID&#39;]`) which have the checkbox&#39;s checked.

Get $_POST from multiple checkboxes

I&#39;ve been trying to re-implement an HTML5 image uploader like the one [on the Mozilla Hacks][1] site, but that works with WebKit browsers. Part of the task is to extract an image file from the `canvas` object and append it to a [FormData][2] object for upload.

The issue is that while `canvas` has the `toDataURL` function to return a representation of the image file, the FormData object only accepts File or Blob objects from the [File API][3].

The Mozilla solution used the following Firefox-only function on `canvas`:

    var file = canvas.mozGetAsFile(&quot;foo.png&quot;);

...which isn&#39;t available on WebKit browsers. The best solution I could think of is to find some way to convert a Data URI into a File object, which I thought might be part of the File API, but I can&#39;t for the life of me find something to do that.

Is it possible? If not, any alternatives?

Thanks.

  [1]: http://hacks.mozilla.org/2011/01/how-to-develop-a-html5-image-uploader/
  [2]: http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#the-formdata-interface
  [3]: http://www.w3.org/TR/file-upload/

Convert Data URI to File then append to FormData

How to escape the `#` hash sign (sometimes known as number sign or pound sign) sent in the query string of a URL?

How to escape hash character in URL

According to the RFC:

&gt;**10.5.3 502 Bad Gateway**&lt;br/&gt;
The server, while acting as a gateway or proxy, received an invalid response from the upstream server it accessed in attempting to fulfill the request.

Can *invalid response* also mean no response at all (e.g. connection refused)?





Should a 502 HTTP status code be used if a proxy receives no response at all?

I&#39;m trying to get the post data in Java. Seems like it should be one of the simplest things to do right? I mean, HttpServletRequest.getParameter has to do it right? So how can you get the raw post data?

I found https://stackoverflow.com/questions/3831680/httpservletrequest-get-post-data and used Kdeveloper&#39;s code to pull the post data from a request. It works, but theres a catch: I can only get that post data *once*.

Heres the method I made from Kdeveloper&#39;s code:

    public static String getPostData(HttpServletRequest req) {
        StringBuilder sb = new StringBuilder();
        try {
            BufferedReader reader = req.getReader();
            reader.mark(10000);

            String line;
            do {
                line = reader.readLine();
                sb.append(line).append(&quot;\n&quot;);
            } while (line != null);
            reader.reset();
            // do NOT close the reader here, or you won&#39;t be able to get the post data twice
        } catch(IOException e) {
            logger.warn(&quot;getPostData couldn&#39;t.. get the post data&quot;, e);  // This has happened if the request&#39;s reader is closed    
        }

        return sb.toString();
    }

Previously I had closed the reader at the end of this method, but that caused exceptions when the method ran more than once on the same request. Without closing it, no exceptions happen, but the method returns an empty string.

Honestly, there should just be an exposed req.getPostData() method - did no one think that would be useful?

So how can I write this method such that it always returns the correct post data?

How to retrieve raw post data from HttpServletRequest in java

I got application server running in Windows – IIS6.0 with Zend Server to execute PHP. I am looking for lightweight static content only web server on this same machine which will relive IIS form handling static content and increase performance.

It need to be only static content web server – maximum small and maximum effective – lighttpd seems too big because allow to FastCGI.

I am looking for: &lt;b&gt;Windows, static content only, fast, and lightweight&lt;/b&gt;.

I am using Windows Server 2003.


Best lightweight web server (only static content) for Windows

Is there anyway to upload a file more than 2 GB, using simple html form upload? Previously I have been uploading large files through silverlight using chunking (dividing a large file into segments and then uploading segments one by one &amp; then reassemble segments at server).

Now, we have a requirement that we just have to use simple html (though GWT) form uploads. Please guide me if there is any way to achieve large file upload this way.

If it is impossible to do it using simple html, can anyone guide me about how I can divide &amp; upload a file in segments using flex?


Large file upload though html form (more than 2 GB)

Given a URL like the following, how can I parse the value of the query parameters? For example, in this case I want the value of `some_key `.

    /some_path?some_key=some_value&#39;

I am using Django in my environment; is there a method on the `request` object that could help me?

I tried using `self.request.get(&#39;some_key&#39;)` but it is not returning the value `some_value` as I had hoped.

Retrieving parameters from a URL

I have a Silverlight application that is building a URL. This URL is a call to a REST-based service. This service expects a single parameter that represents a location. The location is in the form of &quot;city, state&quot;. To build this URL, I&#39;m calling the following code:

    string url = &quot;http://www.example.com/myService.svc/&quot;;
    url += HttpUtility.UrlEncode(locationTextBox.Text);

If a user enters &quot;chicago, il&quot; into locationTextBox, the result looks like this:

&lt;!-- language: lang-none --&gt;

    http://www.example.com/myService.svc/chicago%2c+il

In reality though, I was kind of expecting the URL to look like;

&lt;!-- language: lang-none --&gt;

    http://www.example.com/myService.svc/chicago,%20il

When testing my service via the browser URL, the one I am expecting works. However, the URL that is being generated is not working. What am I doing wrong?





Encoding parameters for a URL

I am refreshing my page using jQuery:

    location.reload();

This is working great but I want to refresh the same page by passing a parameter to URL. 

How can I do this by using jQuery?

Ex:

If my url is `www.myweb.com`, I want to refresh this by passing a parameter like this

      www.myweb.com?single

Thank you

How to refresh a page with jQuery by passing a parameter to URL

I know that `document.URL` can not be set, while `location.href` can.

But the Document indicates:
 
&gt; URL is a replacement for the DOM Level 0 `location.href` property.

So when would we use `document.URL`?

Difference between document.URL and location.href

[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 am new to this kind of stuff, but lately I&#39;ve been hearing a lot about how good [Node.js][1] is. Considering how much I love working with jQuery and JavaScript in general, I can&#39;t help but wonder how to decide when to use Node.js. The web application I have in mind is something like [Bitly][2] - takes some content, archives it. 

From all the homework I have been doing in the last few days, I obtained the following information. Node.js 

 - is a command-line tool that can be run as a regular web server and lets one run JavaScript programs
 - utilizes the great [V8 JavaScript engine][3]
 - is very good when you need to do several things at the same time
 - is event-based so all the wonderful [Ajax][4]-like stuff can be done on the server side
 - lets us share code between the browser and the backend
 - lets us talk with MySQL

Some of the sources that I have come across are:

  - [Diving into Node.js – Introduction and Installation][5]
  - [Understanding NodeJS][6]
  - [Node by Example][7] ([Archive.is][13])
  - [Let’s Make a Web App: NodePad][8]

Considering that Node.js can be run almost out-of-the-box on [Amazon&#39;s EC2][9] instances, I am trying to understand what type of problems require Node.js as opposed to any of the mighty kings out there like [PHP][10], [Python][11] and [Ruby][12]. I understand that it really depends on the expertise one has on a language, but my question falls more into the general category of: When to use a particular framework and what type of problems is it particularly suited for?

  [1]: http://en.wikipedia.org/wiki/Node.js
  [2]: https://en.wikipedia.org/wiki/Bitly
  [3]: http://en.wikipedia.org/wiki/V8_%28JavaScript_engine%29
  [4]: http://en.wikipedia.org/wiki/Ajax_%28programming%29
  [5]: http://www.stoimen.com/blog/2010/11/16/diving-into-node-js-introduction-and-installation/
  [6]: http://debuggable.com/posts/understanding-node-js:4bd98440-45e4-4a9a-8ef7-0f7ecbdd56cb
  [7]: http://blog.osbutler.com/categories/node-by-example/?page=3
  [8]: http://dailyjs.com/2010/11/01/node-tutorial/
  [9]: http://en.wikipedia.org/wiki/Amazon_Elastic_Compute_Cloud
  [10]: http://en.wikipedia.org/wiki/PHP
  [11]: http://en.wikipedia.org/wiki/Python_%28programming_language%29
  [12]: http://en.wikipedia.org/wiki/Ruby_%28programming_language%29
  [13]: http://archive.is/exhaR


How to decide when to use Node.js?

Apologies if this has already been asked and answered; I&#39;ve looked around a bunch but haven&#39;t found exactly what I&#39;m asking.

--

1. Suppose my web app at http://example.com/ uses a private and undocumented web API at http://api.example.com/ to fetch data, e.g. via XHR or JSONP.

2. Also suppose that this web app is anonymous &amp;mdash; it does *not* require user login.

3. Since there&#39;s communication between client and server, anyone can open Fiddler, etc. to see the exact request and response, not to mention inspect the client-side JS code.

In a case like this, how can you prevent someone from using your API in a **_non-web_** client app? E.g. an iPhone app, or server-side.

To my understanding, point #2 removes the option of something like OAuth, and point #3 removes the option of e.g. API keys or even SSL.

I&#39;ve thought about things like time-based tokens or secret salts that are injected into the page on first load, but an iPhone app could easily just secretly load your webpage before making API requests.

So is there any way besides just plain obfuscation &amp;mdash; security through obscurity?

--

In case all that is too abstract, here&#39;s a simple example:

Google.com fetches its auto-complete data via some API that&#39;s private and undocumented &amp;mdash; but open on the web. What&#39;s to stop me from using it in my iPhone app?

How to prevent arbitrary client apps from using anonymous web API?

A simple GET request with no custom headers. The response is returned as expected. The data in the body is accessible, but not the headers.

When I try to access the &quot;etag&quot; header, browsers raise an exception :
&gt; Refused to get unsafe header &quot;etag&quot;

Chrome, Safari and Firefox all behave the same. I didn&#39;t test it on IE.

What am I missing here?

Cross Domain Resource Sharing GET: &#39;refused to get unsafe header &quot;etag&quot;&#39; from Response

Many people have been saying, use pushState rather than hashbang.

What I don&#39;t understand is, how would you be search-engine friendly without using hashbang?

Presumably your pushState content is generated by client-side JavaScript code.

The scenario is thusly:

I&#39;m on `example.com`. My user clicks a link: `href=&quot;example.com/blog&quot;`

pushState captures the click, updates the URL, grabs a JSON file from somewhere, and creates the listing of blog posts in the content area.

With hashbangs, google knows to go to the escaped_fragment URL to get their static content.

With pushState, Google just sees nothing as it can&#39;t use the JavaScript code to load the JSON and subsequently create the template.

The only way to do it I can see is to render the template on the server side, but that completely negates the benefits of pushing the application layer to the client.

So am I getting this right, pushState is not SEO friendly for client-side applications at all?


pushState and SEO

Where is it acceptable to put css folders and image file folders? I was thinking inside the view folder? However the controller always reroutes the path to the base url so I have to specify the path in the .html file to where it sits, which is redundant.

Content Type	Original Author	Original Content on Stackoverflow
Question	Bozho	View Question on Stackoverflow
Solution 1 - Html	Sarfraz	View Answer on Stackoverflow
Solution 2 - Html	xzyfer	View Answer on Stackoverflow
Solution 3 - Html	Peter O'Brien	View Answer on Stackoverflow

Absolute URLs omitting the protocol (scheme) in order to preserve the one of the current page

Html Problem Overview

Html Solutions

Solution 1 - Html

Solution 2 - Html

Solution 3 - Html

What's the difference between "virtual memory" and "swap space"?

Shortest way to slice even/odd lines from a python array?

Attributions