I would just use the `request.remote_ip` that&#39;s simple and it works. Any reason you need another method?

See: https://stackoverflow.com/questions/3887943/ip-address-in-rails
for some other things you can do with client server ip&#39;s.

`request.remote_ip` is an interpretation of all the available IP address information and it will make a best-guess. If you access the variables directly you assume responsibility for testing them in the correct precedence order. Proxies introduce a number of headers that create environment variables with different names.


Get client ip using command:

    request.remote_ip

I found `request.env[&#39;HTTP_X_FORWARDED_FOR&#39;]` very useful too in cases when `request.remote_ip` returns `127.0.0.1`

For anyone interested and using a newer rails and the Devise gem: Devise&#39;s &quot;trackable&quot; option includes a column for current/last_sign_in_ip in the users table.

I just came to realize, by reading some questions and answers on StackOverflow, that adding event handlers using `+=` in C# (or i guess, other .net languages) can cause common memory leaks...

I have used event handlers like this in the past many times, and never realized that they can cause, or have caused, memory leaks in my applications.

How does this work (meaning, why does this actually cause a memory leak) ?&lt;br/&gt;
How can I fix this problem ? Is using `-=` to the same event handler enough ?&lt;br/&gt;
Are there common design patterns or best practices for handling situations like this ?&lt;br/&gt;
Example : How am I supposed to handle an application that has many different threads, using many different event handlers to raise several events on the UI ?

Are there any good and simple ways to monitor this efficiently in an already built big application?


Why and How to avoid Event Handler memory leaks?

I have the following:

    answers = Answer.objects.filter(id__in=[answer.id for answer in answer_set.answers.all()])

then later:

    for i in range(len(answers)):
        # iterate through all existing QuestionAnswer objects
        for existing_question_answer in existing_question_answers:
            # if an answer is already associated, remove it from the
            # list of answers to save
            if answers[i].id == existing_question_answer.answer.id:
                answers.remove(answers[i])           # doesn&#39;t work
                existing_question_answers.remove(existing_question_answer)

I get an error:

    &#39;QuerySet&#39; object has no attribute &#39;remove&#39;

I&#39;ve tried all sorts to convert the QuerySet to a standard set or list. Nothing works.

How can I remove an item from the QuerySet so it doesn&#39;t delete it from the database, and doesn&#39;t return a new QuerySet (since it&#39;s in a loop that won&#39;t work)?

How to convert a Django QuerySet to a list?

In Rails, what&#39;s the best way to get the ip address of the client connecting to the server?

Here are two ways I&#39;ve found:

    request.remote_ip
    request.env[&#39;HTTP_X_REAL_IP&#39;]



Rails: Get Client IP address

In Rails, what's the best way to get the ip address of the client connecting to the server?
Here are two ways I've found:
<pre><code class="hljs language-css">request.remote_ip
request.env['HTTP_X_REAL_IP']
</code></pre>

I&#39;m on a mac, doing:

    rails server

I get:


    2010-12-17 12:35:15] INFO  WEBrick 1.3.1
    [2010-12-17 12:35:15] INFO  ruby 1.8.7 (2010-08-16) [i686-darwin10.4.0]
    [2010-12-17 12:35:15] WARN  TCPServer Error: Address already in use - bind(2)
    Exiting

I know I can start one on a new port, but I want to kill this process.



Rails server says port already used, how to kill that process?

This tag with rails 3

    &lt;%= link_to &#39;Destroy&#39;, item, :method =&gt; :delete,:confirm=&gt;&#39;Are you sure?&#39; %&gt;

produces this html

    &lt;a href=&quot;/news/3&quot; data-confirm=&quot;Are you sure?&quot; data-method=&quot;delete&quot; rel=&quot;nofollow&quot;&gt;Destroy&lt;/a&gt;


The entry is deleted, the problem is that the popup appears twice.

What could be causing this?

link_to :confirm displays popup twice

What are the standard way of making a Ruby on Rails application that will have pages such as

- Home
- About
- Contact

I would appricate if someone had links or an answers rather than just say use a gem because I want to learn how to make simple webapps with such behavior. 



Static pages in Ruby on Rails

I want to execute one update raw sql like below:

    update table set f1=? where f2=? and f3=?

This SQL will be executed by `ActiveRecord::Base.connection.execute`, but I don&#39;t know how to pass the dynamic parameter values into the method.

Could someone give me any help on it? 

How to execute a raw update sql with dynamic binding in rails

I have a simple search form in my Rails 3 app:

    &lt;%= form_tag search_path, :method =&gt; &quot;get&quot; do %&gt;
      &lt;%= text_field_tag :q, params[:q] %&gt;
      &lt;%= submit_tag &quot;search&quot;, :name =&gt; nil %&gt;
    &lt;% end %&gt;

When the user hits the submit button, they get taken to the URL: http://myapp.com/search?utf8=%E2%9C%93&amp;q=foobar
(where `%E2%9C%93` gets displayed as a checkmark: ✓).

I&#39;m not doing anything with the `utf8` parameter, so I want to keep the URL clean by removing it entirely. That is, I want users to get taken to the URL: http://myapp.com/search?q=foobar instead.

How do I do this?

Removing &quot;utf8=✓&quot; from Rails 3 form submissions

Is there any way that I could get the original IP address of the client coming to the server?
I can use `request.getRemoteAddr()`, but I always seem to get the IP of the proxy or the web server.

I would want to know the IP address that the client is using to connect to me. Is there anyway that I could get it?


How do I get the remote address of a client in servlet?

Readability aside, are there any discernable differences (performance perhaps) between using 

    str.indexOf(&quot;src&quot;) 

and 

    str.match(/src/)

I personally prefer `match` (and regexp) but colleagues seem to go the other way. We were wondering if it mattered ...?

EDIT:

I should have said at the outset that this is for functions that will be doing partial plain-string matching (to pick up identifiers in class attributes for JQuery) rather than full regexp searches with wildcards etc.

    class=&#39;redBorder DisablesGuiClass-2345-2d73-83hf-8293&#39; 

So it&#39;s the difference between:

    string.indexOf(&#39;DisablesGuiClass-&#39;);

and

    string.match(/DisablesGuiClass-/)



JavaScript: indexOf vs. Match when Searching Strings?

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?

Are there are any Linux mysql command line tools that don&#39;t require the entire mysql db installation package to be installed?  

What I&#39;m trying to do is from server #1 (app server), execute mysql commands that will get executed on server #2 (db server).  I do not want to run the db on the local server or to install the full blown mysql db.

Is there a way to only install the mysql client (Linux)?

Is there a c# client that follows the socket.io protocol? I have a socket.io server that is communicating with a socket.io javascript client via a website, but i also need to connect a c# piece to it that can send and receive messages. Is there a clean way to do this currently or will I have to write my own client.

Communicating with a socket.io server via c#

Is it safe to trust `$_SERVER[&#39;REMOTE_ADDR&#39;]`? Can it be substituted by changing the header of request or something like that?

Is it safe to write something like that?

    if ($_SERVER[&#39;REMOTE_ADDR&#39;] == &#39;222.222.222.222&#39;) { // my ip address
        $grant_all_admin_rights = true;
    }

Is it safe to trust $_SERVER[&#39;REMOTE_ADDR&#39;]?

&gt; **Possible Duplicate:**  
&gt; [How to store an IP in mySQL](https://stackoverflow.com/questions/1108918/how-to-store-an-ip-in-mysql)  

&lt;!-- End of automatically inserted text --&gt;

I want to get the IP address from `$_SERVER[&#39;REMOTE_ADDR&#39;]` and some other `$_SERVER` variables, which datatype is the right one for this?

Is it `VARCHAR(n)`?

Which MySQL datatype to use for an IP address?

I&#39;ve been trying to get an efficient regex for IPv4 validation, but without much luck. It seemed at one point I had had it with `(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?(\.|$)){4}`, but it produces some strange results:


    $ grep --version
    grep (GNU grep) 2.7
    $ grep -E &#39;\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?(\.|$)){4}\b&#39; &lt;&lt;&lt; 192.168.1.1
    192.168.1.1
    $ grep -E &#39;\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?(\.|$)){4}\b&#39; &lt;&lt;&lt; 192.168.1.255
    192.168.1.255
    $ grep -E &#39;\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?(\.|$)){4}\b&#39; &lt;&lt;&lt; 192.168.255.255
    $ grep -E &#39;\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?(\.|$)){4}\b&#39; &lt;&lt;&lt; 192.168.1.2555
    192.168.1.2555

I did a search to see if this had already been asked and answered, but other answers appear to simply show how to determine 4 groups of 1-3 numbers, or do not work for me.



Validating IPv4 addresses with regexp

how can I convert a string ipAddress (struct in_addr) and vice versa?
and how do I turn in unsigned long ipAddress?
thanks

Content Type	Original Author	Original Content on Stackoverflow
Question	ma11hew28	View Question on Stackoverflow
Solution 1 - Ruby on-Rails	loosecannon	View Answer on Stackoverflow
Solution 2 - Ruby on-Rails	tadman	View Answer on Stackoverflow
Solution 3 - Ruby on-Rails	puneet18	View Answer on Stackoverflow
Solution 4 - Ruby on-Rails	alikk	View Answer on Stackoverflow
Solution 5 - Ruby on-Rails	NorseGaud	View Answer on Stackoverflow

Rails: Get Client IP address

Ruby on-Rails Problem Overview

Ruby on-Rails Solutions

Solution 1 - Ruby on-Rails

Solution 2 - Ruby on-Rails

Solution 3 - Ruby on-Rails

Solution 4 - Ruby on-Rails

Solution 5 - Ruby on-Rails

How to convert a Django QuerySet to a list?

Why and How to avoid Event Handler memory leaks?

Attributions