In Chrome Developer Tools switch to the Network tab and on the Size column it will either give you the size of the downloaded content or say *(from disk/memory cache)*.

[![Cached requests][1]][1]


  [1]: https://i.stack.imgur.com/koloU.png

**If you can&#39;t see the size column then you may need to close this window**

[![close the headers, preview, response tab][1]][1]

The size column will tell you if the response is coming from cache or over the network.


  [1]: https://i.stack.imgur.com/KIIfL.jpg

I saw this recently, thought it was interesting.  But I don&#39;t really understand what it does?

Ex.  I have a rails app and I want to bootstrap some json, so that I don&#39;t have to make a second request.  Normally I would write something like this.

`&lt;%= raw @model.to_json %&gt;`
or
`&lt;%= @model.to_json.html_safe %&gt;`

I have to send the message `raw` or `html_safe` or the json will be html escaped and thus not parsed correctly.  However, this seems to work too.

`&lt;%== @model.to_json %&gt;`

But I can&#39;t find any documentation.

Does anyone know what this does exactly?  i.e.  Is it the exact same as calling `html_safe` or `raw`?  Or is there more to it?

What does &lt;%== %&gt; do in rails erb?

I understand there has been a lot of discussion on this but I have yet to find a solution to fix my needs. Basically I need to autogrow a text area not when you type but on load. I am pulling in content from a database and dependant on the user&#39;s settings an overlay is produced over the text area, but upon doing this the text areas are not scrollable therefore I need to autosize these to show all the text.

I have tried scrollHeight but this is not working great as there are multiple text boxes on the screen

Thanks

Resize text area to fit all text on load jquery

In Google Chrome, how you can check which files are served from the browser cache, and which comes from the server?

Check whether network response is coming from server or Chrome cache

<p>In Google Chrome, how you can check which files are served from the browser cache, and which comes from the server?</p>


I was testing some HTML code I&#39;m making, and while using the Developer Tools on Google Chrome version 22.0.1229.94 m, I saw the `&lt;body&gt;` tag has the attribute `cz-shortcut-listen=&quot;true&quot;` (which of course is not on my code). **What does it mean and why is it showing up?** (I tried looking it up in google, but found nothing relevant)

![Screenshot][1]


  [1]: http://i.stack.imgur.com/xBiYX.jpg

HTML Body shows cz-shortcut-listen=&quot;true&quot; with Chrome&#39;s Developer Tools?

Since the last update of Google Chrome, a screen ruler shows up when inspecting an element. Does anyone know how to disable this ruler?

Google Chrome disable screen ruler

I am trying to debug the features of a website when users disable their JavaScript. I was wondering how do you disable JavaScript for a page from the Google Chrome DevTools?

How to disable JavaScript in Chrome Developer Tools?

I have found [articles][1] regarding cache behaviour so I can only assume that it&#39;s not much different but I wanted to make sure.

I have read that most browser have 5MB (give or take) for localStorage and I was interested in what would be the behaviour of the browsers?

I understand every browser acts differently but I&#39;m interested mostly in Safari, Chrome and Firefox (as those are the ones I consider as browsers).

 - Will the browsers mentioned above delete data from my website or it will choose &quot;the oldest&quot; or something of the sort?
 - Will my item be saved in such case?

**And the most important :**

 - Lets say I &quot;abuse&quot; the localStorage on my website trying to use it all up, and in the same page I&#39;m filling it up and trying to save more. Will I get a warning? Will the `getItem` return `null` when this happens or is it somehow saved in memory?

 - What happens if I try and save an item larger than the `localStorage` size?

 **Answered:**  answer can be found [here][2]

 - Can the same exact behaviour be expected from sessionStorage which allegedly should be the same?

I know this is a lot of questions but I&#39;m trying to understand all that&#39;s related to the subject, I&#39;d be thankful for any part of the question you can answer.


  [1]: http://code.google.com/speed/page-speed/docs/caching.html
  [2]: https://stackoverflow.com/questions/12508274/does-amplify-store-return-error-or-catch-exception-when-local-storage-limit-exce

What happens when localStorage is full?

&gt; Duplicate headers received from server
&gt;
&gt; The response from the server contained duplicate headers. This problem is generally the result of a misconfigured website or proxy. Only the website or proxy administrator can fix this issue.
&gt;
&gt; Error 349 (net::ERR_RESPONSE_HEADERS_MULTIPLE_CONTENT_DISPOSITION): Multiple distinct Content-Disposition headers received. This is disallowed to protect against HTTP response splitting attacks.

 I found this error while exporting to pdf in chrome.

    Response.Buffer = false;
    Response.ClearHeaders();
    string ext = objProp.PACKAGEFILENAME.Substring(objProp.PACKAGEFILENAME.LastIndexOf(&quot;.&quot;));
    string ext1 = ext.Substring(1);
    Response.ContentType = ext1;
    Response.AddHeader(&quot;Content-Disposition&quot;, &quot;target;_blank,attachment; filename=&quot; + objProp.PACKAGEFILENAME);
    const int ChunkSize = 1024;
    byte[] binary = objProp.PACKAGEDOCUMENT;
    System.IO.MemoryStream ms = new System.IO.MemoryStream(binary);
    int SizeToWrite = ChunkSize;

    for (int i = 0; i &lt; binary.GetUpperBound(0) - 1; i = i + ChunkSize)
    {
        if (!Response.IsClientConnected) return;
        if (i + ChunkSize &gt;= binary.Length) SizeToWrite = binary.Length - i;
        byte[] chunk = new byte[SizeToWrite];
        ms.Read(chunk, 0, SizeToWrite);
        Response.BinaryWrite(chunk);
        Response.Flush();
    }
    Response.Close();

How to fix this?

Duplicate headers received from server

I have a webpage **index.html** hosted on a particular server. I have pointed `example.com` to `example.com/index.html`. So when I make changes in index.html and save it, and then try to open example.com, the changes are not reflected. Reason that the webpages are being cached.

Then I manually refresh the page and since it loads the fresh copies and not from cache, it works fine. But I cannot ask my client to do so, and they want everything to be perfect. So my question is that is there a trick or technique as to how I can make the file load every time from the server and not from cache?

P.S: I know the trick for CSS, JS and images files, i.e. appending `?v=1` but don&#39;t know how to do it for index.html.

Any help would be appreciated. Thanks!

Load index.html every time from the server and NOT from cache

I am using Guava to cache hot data. When the data does not exist in the cache, I have to get it from database:

    public final static LoadingCache&lt;ObjectId, User&gt; UID2UCache = CacheBuilder.newBuilder()
            //.maximumSize(2000)
            .weakKeys()
            .weakValues()
            .expireAfterAccess(10, TimeUnit.MINUTES)
            .build(
            new CacheLoader&lt;ObjectId, User&gt;() {
                @Override
                public User load(ObjectId k) throws Exception {
                    User u = DataLoader.datastore.find(User.class).field(&quot;_id&quot;).equal(k).get();
                    return u;
                }
            });

My problem is when the data does not exists in database, I want it to return `null` and to not do any caching. But Guava saves `null` with the key in the cache and throws an exception when I get it:

&gt; com.google.common.cache.CacheLoader$InvalidCacheLoadException:
&gt; CacheLoader returned null for key shisoft.

How do we avoid caching `null` values?

How to avoid caching when values are null?

If I use an ObjectCache and add an item like so:

    ObjectCache cache = MemoryCache.Default;
    string o = &quot;mydata&quot;;
    cache.Add(&quot;mykey&quot;, o, DateTime.Now.AddDays(1));

I understand the object will expire in 1 day. But if the object is accessed 1/2 a day later using:

    object mystuff = cache[&quot;mykey&quot;];

Does this reset the timer so it&#39;s now 1 day since the last access of the entry with the key &quot;mykey&quot;, or it still 1/2 a day until expiry?

If the answer is no is there is a way to do this I would love to know.

Thanks.



.NET Caching how does Sliding Expiration work?

I&#39;m wondering if there are any differences between `MemoryCache` and `HttpRuntime.Cache`, which one is preferred in ASP.NET MVC projects?

As far as I understand, both are thread safe, API is from first sight more or less the same, so is there any difference when to use which?

System.Runtime.Caching.MemoryCache vs HttpRuntime.Cache - are there any differences?

I want to be able to create a custom AngularJS service that makes an HTTP &#39;Get&#39; request when its data object is empty and populates the data object on success.

The next time a call is made to this service, I would like to bypass the overhead of making the HTTP request again and instead return the cached data object.

Is this possible?

Cache an HTTP &#39;Get&#39; service response in AngularJS?

I&#39;m wondering how to go about obtaining the value of a POST/GET request variable using Python with Flask.

With Ruby, I&#39;d do something like this:

    variable_name = params[&quot;FormFieldValue&quot;]

How would I do this with Flask?




How to obtain values of request variables using Python and Flask

I&#39;m trying to do a DELETE http request using PHP and cURL.

I have read how to do it many places, but nothing seems to work for me.

This is how I do it:

    public function curl_req($path,$json,$req)
    {
        $ch = curl_init($this-&gt;__url.$path);
        $data = json_encode($json);
        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $req);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, array(&#39;Content-Type: application/json&#39;,&#39;Content-Length: &#39; . strlen($data)));
        $result = curl_exec($ch);
        $result = json_decode($result);
        return $result;
    }

I then go ahead and use my function:

    public function deleteUser($extid)
    {
        $path = &quot;/rest/user/&quot;.$extid.&quot;/;token=&quot;.$this-&gt;__token;
        $result = $this-&gt;curl_req($path,&quot;&quot;,&quot;DELETE&quot;);
        return $result;

    }

This gives me HTTP internal server ERROR. 
In my other functions using the same curl_req method with GET and POST, everything goes well. 

So what am I doing wrong?

PHP CURL DELETE request

In this period I am studing the Spring MVC showcase example (downloadable from STS dasboard) and I have some simple question about the `Request Mapping` examples:

1) In my `home.jsp` page I have this link:

			&lt;li&gt;
				&lt;a id=&quot;byParameter&quot; class=&quot;textLink&quot; href=&quot;&lt;c:url value=&quot;/mapping/parameter?foo=bar&quot; /&gt;&quot;&gt;By path, method, and presence of parameter&lt;/a&gt;
			&lt;/li&gt;

As you can see by this link I am doing an HTTP GET Request having a &quot;foo&quot; parameter containing the value: &quot;bar&quot;.

This HTTP Request is handled by the following method of the controller class MappingController:

	@RequestMapping(value=&quot;/mapping/parameter&quot;, method=RequestMethod.GET, params=&quot;foo&quot;)
	public @ResponseBody String byParameter() {
		return &quot;Mapped by path + method + presence of query parameter! (MappingController)&quot;;
	}

This method manage HTTP Request (only `GET` type) that have a parameter named &quot;foo&quot;

How can I take the value (&quot;bar&quot;) of this parameter and put it in a variable inside the code of my by Parameter method?

Spring MVC How take the parameter value of a GET HTTP Request in my controller method?

&gt; **Possible Duplicate:**  
&gt; [How to download image using requests](https://stackoverflow.com/questions/13137817/how-to-download-image-using-requests)  

&lt;!-- End of automatically inserted text --&gt;

I know that fetching a url is as simple as `requests.get` and I can get at the raw response body and save it to a file, but for large files, is there a way to stream directly to a file? Like if I&#39;m downloading a movie with it or something?

Save a large file using the Python requests library

In an HTTP **GET** request, parameters are sent as a ***query string***:

&lt;pre&gt;http://example.com/page&lt;b&gt;&lt;i&gt;?parameter=value&amp;also=another&lt;/i&gt;&lt;/b&gt;&lt;/pre&gt;

In an HTTP **POST** request, the parameters are not sent along with the URI.

***Where are the values?*** In the request header? In the request body? What does it look like?

How are parameters sent in an HTTP POST request?

Well, this is pretty straightforward. If Chrome&#39;s Developer Tools is showing me that a style is overridden, how to see what CSS rule is overriding it?

I want to know if is there anything like *&quot;Show me what overrides this&quot;*.



**OBS:** *Please, don&#39;t point me to Firebug.*

Chrome Developer Tools: How to find out what is overriding a CSS rule?

As the title is it possible to emulate orientation in google chrome or firefox? Meaning somehow change the browser to support media query (orientation = (landscape or portrait))

I have a emulator for mobile, but I would like to have the developer tools from chrome or firebug.


### Update

Chrome v25 specific...

To anyone, in **Google Chrome Dev Tool &gt; Overrides &gt; Override Device Orientation** you can change the `alpha`, `beta` and `gamma`. I think this is a place to start of from, but I have no idea how these work and can therefor not find anything..

It is also possible to Emulate CSS Media, but not portrait and landscape, but print, screen, tv etc.

### Update v2
This is a old question, and Chrome have changed multiple times how to do this. 

Is it possible to emulate orientation in a browser?

When using [Safari Web Inspector][1] to read the JavaScript console output, the log is reset upon navigation i.e. going from page *index.html* to *mail.html* clears the console output. In the [Chrome Developer Tools][2], I can easily preserve the log by right clicking on the console space and selecting *Preserve Log Upon Navigation*. With this option, console log output remains intact until I manually clear the output simplifying the process of debugging JavaScript that refreshes or redirects to another page. 

Is there a similar feature in Safari Web Inspector? 


  [1]: https://developer.apple.com/library/safari/documentation/AppleApplications/Conceptual/Safari_Developer_Guide/Introduction/Introduction.html
  [2]: https://developers.google.com/chrome-developer-tools/docs/console

Safari Developer Tools: How to Preserve Console Log Upon Navigation?

I am doing the C[hrome debugging tutorial][1], using NetBeans and Google Chrome. Everything, including extensions, seems to work correctly, but when I get to section `Use the Debugger`, I cannot see the html code to insert a breakpoint.

After selecting inspect popup on the browser, it opens in Console, showing nothing, Elements shows popup.html with images added. When I go to Sources, the file popup.html can be opened, but the only line, Line 1, is blank. If I open the js file, the js file is there and can be edited (break pointed).

I am sorry - probably something basic, but I&#39;m not very experienced with this. I&#39;ve tried reloading and refreshing everything.

FOLLOW-UP: By entering `location.reload(true)` into the Console prompt, the popup.html file became visible as Source! Why? No idea.

I hope this saves someone the full day I spent stumbling around.


  [1]: http://developer.chrome.com/extensions/tut_debugging.html

Chrome Developer tool: html script is blank (in source) debugging tutorial

I use some themes for Google Developer Tools from this website: http://devthemez.com/themes/chrome-developer-tools

However, after the 32.0.1700.76 m update, all themes have stopped working.

What do I need to do to get them working again?


Content Type	Original Author	Original Content on Stackoverflow
Question	Vishwajeet	View Question on Stackoverflow
Solution 1 - Google Chrome	James	View Answer on Stackoverflow
Solution 2 - Google Chrome	joshuakcockrell	View Answer on Stackoverflow

Check whether network response is coming from server or Chrome cache

Google Chrome Problem Overview

Google Chrome Solutions

Solution 1 - Google Chrome

Solution 2 - Google Chrome

Resize text area to fit all text on load jquery

What does <%== %> do in rails erb?

Attributions