This should be pretty close

    String dateString = &quot;Wed, 09 Apr 2008 23:55:38 GMT&quot;;
    SimpleDateFormat format = new SimpleDateFormat(&quot;EEE, dd MMM yyyy HH:mm:ss zzz&quot;);
    Date d = format.parse(dateString);

[SimpleDateFormat][1]


  [1]: http://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html

[`DateUtil.parseDate(dateString)`][1] from apache http-components

(legacy: &lt;a href=&quot;http://hc.apache.org/httpclient-3.x/apidocs/org/apache/commons/httpclient/util/DateUtil.html#parseDate%28java.lang.String%29&quot;&gt;`DateUtil.parseDate(dateString)`&lt;/a&gt; (from apache commons-httpclient))

It has the correct format defined as a Constant, which is guaranteed to be compliant with the protocol.


  [1]: http://hc.apache.org/httpcomponents-client-ga/httpclient/apidocs/org/apache/http/impl/cookie/DateUtils.html

# java.time

When using the new [Java Date and Time API][1] the code would simply be:

    ZonedDateTime zdt = ZonedDateTime.parse(&quot;Wed, 09 Apr 2008 23:55:38 GMT&quot;, DateTimeFormatter.RFC_1123_DATE_TIME);

The [`DateTimeFormatter`](https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html) class pre-defines a constant for that particular format in [`RFC_1123_DATE_TIME`](https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html#RFC_1123_DATE_TIME). As the name suggests, [RFC 1123][2] defines that format.


  [1]: https://docs.oracle.com/javase/8/docs/api/java/time/package-summary.html
  [2]: https://www.rfc-editor.org/rfc/rfc1123

RFC 2616 defines three different date formats that a conforming client must understand.

The Apache HttpClient provides a DateUtil that complies with the standard:

https://hc.apache.org/httpcomponents-client-4.3.x/httpclient/apidocs/org/apache/http/client/utils/DateUtils.html

https://apache.googlesource.com/httpclient/+/4.3.x/httpclient/src/main/java/org/apache/http/client/utils/DateUtils.java

  `Date date = DateUtils.parseDate( headerValue );`


If you&#39;re using `URLConnection`s, there is already a handy method.

See
[URLConnection#getLastModified]( http://docs.oracle.com/javase/7/docs/api/java/net/URLConnection.html#getLastModified())

This method parses the date string and returns a milliseconds value. Then you can happily create a `Date` with that value.

I have a Mercurial repository for a personal project, and I have been storing the master repository in my Dropbox for a few weeks now (something along [this line][1]; and I understand it&#39;s also [possible with git][2]). 

The idea is that it serves both as a way to work with multiple machines and as a remote backup. *I clone the repository and work on the non-Dropbox copy, and only push updates once in a while, the same way I would, I suppose, work with Bitbucket.* 

Can you think of any drawbacks to this idea, compared to using dedicating hosting (BitBucket in the case of Mercurial)? *I know Bitbucket has free accounts for single users, which is great, but they are limited to 150M, which isn&#39;t a huge*. 

In particular, is it possible that Dropbox&#39;s sync process would corrupt the repository? I had to run *hg recover* once on the master repository, but it might be unrelated (and anyway it happily recovered). Does anyone have a bad experience with the idea? Does anyone have a longer good experience and can alleviate my worries? Does anyone have an opinion based on better understanding of the internals of these things?

edit: I added some clarifications to the questions. They are in *italics*. 

  [1]: http://iamthewalr.us/blog/2009/02/mercurial-and-dropbox/
  [2]: https://stackoverflow.com/questions/1960799/using-gitdropbox-together-effectively

Mercurial (and, I guess Git) with Dropbox: any drawbacks?

is there a way in C++ to determine the CPU&#39;s cache size? i have an algorithm that processes a lot of data and i&#39;d like to break this data down into chunks such that they fit into the cache. Is this possible?
Can you give me any other hints on programming with cache-size in mind (especially in regard to multithreaded/multicore data processing)?

Thanks!

C++ cache aware programming

HTTP Last-Modified header contains date in following format (example):  
`Wed, 09 Apr 2008 23:55:38 GMT`  
What is the easiest way to parse **java.util.Date** from this string?

How to parse Date from HTTP Last-Modified header?

HTTP Last-Modified header contains date in following format (example): 
<code>Wed, 09 Apr 2008 23:55:38 GMT</code> 
What is the easiest way to parse java.util.Date from this string?

I have a requirement to calculate the average of a very large set of doubles (10^9 values).  The sum of the values exceeds the upper bound of a double, so does anyone know any neat little tricks for calculating an average that doesn&#39;t require also calculating the sum?

I am using Java 1.5.  

What is a good solution for calculating an average where the sum of all values exceeds a double&#39;s limits?

I&#39;d like to get started with ANTLR, but after spending a few hours reviewing the examples at the [antlr.org](http://www.antlr.org/) site, I still can&#39;t get a clear understanding of the grammar to Java process.

Is there some simple example, something like a four-operations calculator implemented with ANTLR going through the parser definition and all the way to the Java source code?

ANTLR: Is there a simple example?

I have used [`LinkedHashMap`][1] because it is important the order in which keys entered in the map.

But now I want to get the value of key in the first place (the first entered entry) or the last.

Should there be a method like `first()` and `last()` or something like that?

Do I need to have an iterator to just get the first key entry? That is why I used [`LinkedHashMap`][1]! 

Thanks!


  [1]: http://java.sun.com/j2se/1.5.0/docs/api/java/util/LinkedHashMap.html

Java LinkedHashMap get first or last entry


what&#39;s a fast way to convert an `Integer` into a `Byte Array`?

e.g. `0xAABBCCDD =&gt; {AA, BB, CC, DD}`

Convert integer into byte array (Java)

I am initializing an array like this:

    public class Array {
        
        int data[] = new int[10]; 
        /** Creates a new instance of Array */
        public Array() {
            data[10] = {10,20,30,40,50,60,71,80,90,91};
        }     
    }

NetBeans points to an error at this line: 

    data[10] = {10,20,30,40,50,60,71,80,90,91};

How can I solve the problem?

How to initialize an array in Java?

By using python, how can I check if a website is up? From what I read, I need to check the &quot;HTTP HEAD&quot; and see status code &quot;200 OK&quot;, but how to do so ?

Cheers

### Related
* [How do you send a HEAD HTTP request in Python?][1]


  [1]: https://stackoverflow.com/questions/107405/how-do-you-send-a-head-http-request-in-python

Checking if a website is up via Python

I have a site that treats &quot;/&quot; and &quot;%2F&quot; in the path portion (not the query string) of a URL differently.  Is this a bad thing to do according to either the RFC or the real world?

I ask because I keep running into little surprises with the web framework I&#39;m using (Ruby on Rails) as well as the layers below that (Passenger, Apache, e.g., I had to enable &quot;ALLOW_ENCODED_SLASHES&quot; for Apache).  I am now leaning toward getting rid of the encoded slashes completely, but I wonder if I should be filing bug reports where I see weird behavior involving the encoded slashes.

As to why I have the encoded slashes in the first place, basically I have routes such as this:

    :controller/:foo/:bar

where :foo is something like a path that can contain slashes.  I thought the most straightforward thing to do would be to just URL escape `foo` so the slashes are ignored by the routing mechanism.  Now I am having doubts, and it&#39;s pretty clear that the frameworks don&#39;t really support this, but according to the RFC is it wrong to do it this way?

Here is some information I have gathered:

RFC 1738 (URLs):
&gt; Usually a URL has the same interpretation when an octet is represented by a character and when it encoded. However, this is not true for reserved characters: encoding a character reserved for a particular scheme may change the semantics of a URL.


RFC 2396 (URIs):
&gt; These characters are called &quot;reserved&quot;, since their usage within the URI component is limited to their reserved purpose. If the data for a URI component would conflict with the reserved purpose, then the conflicting data must be escaped before forming the URI.

(does escaping here mean something other than encoding the reserved character?)

RFC 2616 (HTTP/1.1):

&gt; Characters other than those in the &quot;reserved&quot; and &quot;unsafe&quot; sets (see RFC 2396 [42]) are equivalent to their &quot;&quot;%&quot; HEX HEX&quot; encoding.

There is also [this bug report](https://rails.lighthouseapp.com/projects/8994/tickets/144-patch-bug-in-rails-route-globbing) for Rails, where they seem to expect the encoded slash to behave differently:

&gt; Right, I&#39;d expect different results because they&#39;re pointing at different resources.
&gt;
&gt; It&#39;s looking for the literal file &#39;foo/bar&#39; in the root directory. The non escaped version is looking for the file bar within directory foo.

It&#39;s clear from the RFCs that raw vs. encoded is the equivalent for unreserved characters, but what is the story for reserved characters?







Is a slash (&quot;/&quot;) equivalent to an encoded slash (&quot;%2F&quot;) in the path portion of an HTTP URL

I have a PHP 5.1.0 website (actually it&#39;s 5.2.9 but it must also run on 5.1.0+).

Pages are generated dynamically but many of them are mostly static. By static I mean the content don&#39;t change but the &quot;template&quot; around the content can change over time.

I know they are several cache systems and PHP frameworks already out there, but my host don&#39;t have APC or Memcached installed and I&#39;m not using any framework for this particular project.

I want the pages to be cached (I think by default PHP &quot;disallow&quot; cache). So far I&#39;m using:

    session_cache_limiter(&#39;private&#39;); //Aim at &#39;public&#39;
    session_cache_expire(180);
    header(&quot;Content-type: $documentMimeType; charset=$documentCharset&quot;);
    header(&#39;Vary: Accept&#39;);
    header(&quot;Content-language: $currentLanguage&quot;);

I read many tutorials but I can&#39;t find something simple (I know cache is something complex, but I only need some basic stuff).

What are &quot;must&quot; have headers to send to help caching?

How to use HTTP cache headers with PHP

I use PHP to generate dynamic Web pages. As stated on the following tutorial (see link below), the MIME type of XHTML documents should be &quot;application/xhtml+xml&quot; when $_SERVER[&#39;HTTP_ACCEPT&#39;] allows it. Since you can serve the same page with 2 different MIMEs (&quot;application/xhtml+xml&quot; and &quot;text/html&quot;) you should set the &quot;Vary&quot; HTTP header to &quot;Accept&quot;. This will help the cache on proxies.

Link:
http://keystonewebsites.com/articles/mime_type.php

Now I&#39;m not sure of the implication of:
header(&#39;Vary: Accept&#39;);
I&#39;m not really sure of what &#39;Vary: Accept&#39; will precisely do...

The only explanation I found is:

&gt; After the Content-Type header, a Vary
&gt; header is sent to (if I understand it
&gt; correctly) tell intermediate caches,
&gt; like proxy servers, that the content
&gt; type of the document varies depending
&gt; on the capabilities of the client
&gt; which requests the document.
http://www.456bereastreet.com/archive/200408/content_negotiation/

Anyone can give me a &quot;real&quot; explanation of this header (**with that value**). I think I understand things like:
Vary: Accept-Encoding
where the cache on proxies could be based on the encoding of the page served, but I don&#39;t understand:
Vary: Accept

What is the function of the &quot;Vary: Accept&quot; HTTP header?

how do I throw a 404 or FileNotFound exception/result from my action and let IIS use my customErrors config section to show the 404 page?

I&#39;ve defined my customErrors like so

    &lt;customErrors mode=&quot;On&quot; defaultRedirect=&quot;/trouble&quot;&gt;
      &lt;error statusCode=&quot;404&quot; redirect=&quot;/notfound&quot; /&gt;
    &lt;/customErrors&gt;



My first attempt at an actionResult that tries to add this doesnt work.

    public class NotFoundResult : ActionResult {
        public NotFoundResult() {
          
        }

        public override void ExecuteResult(ControllerContext context) {
            context.HttpContext.Response.TrySkipIisCustomErrors = false;
            context.HttpContext.Response.StatusCode = 404;
        }
    }

But this just shows a blank page and not my /not-found page

:(

What should I do?

throwing/returning a 404 actionresult or exception in Asp.net MVC and letting IIS handle it

Is there a built-in method for converting a `date` to a `datetime` in Python, for example getting the `datetime` for the midnight of the given date? The opposite conversion is easy: `datetime` has a `.date()` method.

Do I really have to manually call `datetime(d.year, d.month, d.day)`?

Convert date to datetime in Python

Is there a quick way to calculate date difference in php? For example:

    $date1 = &#39;2009-11-12 12:09:08&#39;;
    $date2 = &#39;2009-12-01 08:20:11&#39;;

And then do a calculation, $date2 minus $date1

I read php.net documentation, but no luck. Is there a quick way to do it?

Date Difference in php on days?

I need a way to detect the timezone of a given date object. I do NOT want the offset, nor do I want the full timezone name. I need to get the timezone abbreviation. 

&gt; For example, GMT, UTC, PST, MST, CST, EST, etc...

Is this possible? The closest I&#39;ve gotten is parsing the result of `date.toString()`, but even that won&#39;t give me an abbreviation. It gives me the timezone&#39;s long name.

Detect timezone abbreviation using JavaScript

The Java class library has a class named DateTime. DateTime has this method:

    int daysBetween(DateTime other)

which returns the number of days between this and the parameter.
It doesn&#39;t have a method

    int secondsBetween(DateTime other)

which I happen to need.
Is there a class which is similar to DateTime but has such a method?

In Java, how do I get the difference in seconds between 2 dates?

I am coding an application where i need to assign random date between two fixed timestamps

how i can achieve this using php i&#39;ve searched first but only found the answer for Java not php

for example :

    $string = randomdate(1262055681,1262055681);



How to generate random date between two dates using php?

I am working on my [REST client library for CodeIgniter][1] and I am struggling to work out how to send PUT and DELETE arguments in PHP.

In a few places I have seen people using the options:

    $this-&gt;option(CURLOPT_PUT, TRUE);
    $this-&gt;option(CURLOPT_POSTFIELDS, $params);

Annoyingly, this seems to do nothing. Is this the correct way to set PUT parameters?

If so, how do I set DELETE parameters?

*$this-&gt;option() is part of my library, it simply builds up an array of CURLOPT_XX constants and sends them to curl_setopt_array() when the built up cURL request is executed.* 

I am attempting to read PUT and DELETE parameters using the following code:

        	case &#39;put&#39;:
		    	// Set up out PUT variables
		    	parse_str(file_get_contents(&#39;php://input&#39;), $this-&gt;_put_args);
    		break;
    		
        	case &#39;delete&#39;:
		    	// Set up out PUT variables
		    	parse_str(file_get_contents(&#39;php://input&#39;), $this-&gt;_delete_args);
    		break;

There are two options here, I am approaching this in the wrong way or there is a bug somewhere in my libraries. If you could let me know if this should theoretically work I can just hammer away on debug until I solve it.

I dont want to waste any more time on an approach that is fundamentally wrong.

  [1]: http://github.com/philsturgeon/codeigniter-restclient

Handling PUT/DELETE arguments in PHP

With PHP, is it possible to send HTTP headers with `file_get_contents()` ?

I know you can send the user agent from your `php.ini` file. However, can you also send other information such as `HTTP_ACCEPT`, `HTTP_ACCEPT_LANGUAGE`, and `HTTP_CONNECTION` with `file_get_contents()` ?

Or is there another function that will accomplish this?

PHP file_get_contents() and setting request headers

What does the following HTTP 1.1 header mean?

&gt; If-None-Match: *

I understand it when using a strong or weak ETag or even a list of ETags, but I don&#39;t understant it&#39;s use when using star (*).

**Edit:** Would be nice to have some pseudocode (PHP code good also) that would show how/what to answer to &quot;If-None-Match: *&quot;.

What does the HTTP header If-None-Match: * mean?

I would like to set up rules in IIS7 for static content caching in my ASP.NET website.

I have seen these articles, which details how to do it using the `&lt;clientCache /&gt;` element in `web.config`:

&gt;[Client Cache `&lt;clientCache&gt;` (IIS.NET)][1]  
&gt;[Add Expires or Cache Control Header to static content in IIS (Stack Overflow)][2]

However, this setting appears to apply globally to all static content. Is there a way to do this just for certain directories or extensions?

For example, I may have two directories which need separate cache settings:

&gt;`/static/images`  
&gt; `/content/pdfs`

Is it possible to set up rules for sending cache headers (`max-age`, `expires`, etc) based on extensions and folder paths?

Please note, I must be able to do this via `web.config` because I don&#39;t have access to the IIS console.


  [1]: http://www.iis.net/ConfigReference/system.webServer/staticContent/clientCache
  [2]: https://stackoverflow.com/questions/865252/add-expires-or-cache-control-header-to-static-content-in-iis

How to configure static content cache per folder and extension in IIS7?

I have the feeling that I&#39;m missing the obvious, but have not succeeded with `man [curl|wget]` or google (&quot;http&quot; makes such a bad search term). I&#39;m looking for a quick&amp;dirty fix to one of our webservers that frequently fails, returning status code 500 with an error message. Once this happens, it needs to be restarted.

As the root cause seems to be hard to find, we&#39;re aiming for a quick fix, hoping that it will be enough to bridge the time until we can really fix it (the service doesn&#39;t need high availability)

The proposed solution is to create a cron job that runs every 5 minutes, checking http://localhost:8080/. If this returns with status code 500, the webserver will be restarted. The server will restart in under a minute, so there&#39;s no need to check for restarts already running.

The server in question is a ubuntu 8.04 minimal installation with just enough packages installed to run what it currently needs. There is no hard requirement to do the task in bash, but I&#39;d like it to run in such a minimal environment without installing any more interpreters. 

(I&#39;m sufficiently familiar with scripting that the command/options to assign the http status code to an environment variable would be enough - this is what I&#39;ve looked for and could not find.)

Content Type	Original Author	Original Content on Stackoverflow
Question	levanovd	View Question on Stackoverflow
Solution 1 - Java	Shaun	View Answer on Stackoverflow
Solution 2 - Java	Bozho	View Answer on Stackoverflow
Solution 3 - Java	Stan Svec	View Answer on Stackoverflow
Solution 4 - Java	ralfstx	View Answer on Stackoverflow
Solution 5 - Java	Jin Kwon	View Answer on Stackoverflow

How to parse Date from HTTP Last-Modified header?

Java Problem Overview

Java Solutions

Solution 1 - Java

Solution 2 - Java

Solution 3 - Java

java.time

Solution 4 - Java

Solution 5 - Java

C++ cache aware programming

Mercurial (and, I guess Git) with Dropbox: any drawbacks?

Attributions