You need to enable Elmah for remote access by adding the following configuration setting to the `&lt;elmah&gt;` section in your web.config file. The default setting for this value is false, which only allows localhost, hence why it is working on your local machine from within Visual Studio.

       &lt;elmah&gt;
          &lt;security allowRemoteAccess=&quot;true&quot;/&gt;
       &lt;/elmah&gt;

I always seem to forget this myself and spend a few minutes scratching my head ;)

Make sure you HttpHandler is defined in the webServer section in your web.config file.

    &lt;system.webServer&gt;
      &lt;httpHandlers&gt;
        &lt;add name=&quot;elmah&quot; verb=&quot;GET&quot; path=&quot;elmah.axd&quot;  type=&quot;Elmah.ErrorLogPageFactory, Elmah&quot;/&gt;
      &lt;/httpHandlers&gt;
    &lt;/system.webServer&gt;

When do you choose to type a given function&#39;s return type as `Seq` vs `Iterable` vs `Traversable` (or alternatively even deeper within `Seq`&#39;s hierarchy)?

How do you make that decision? We have a lot of code that returns `Seq`s by default (usually starting from results of a DB query and successive transformations). I tend to want to make the return types `Traversable` by default and `Seq` when specifically expecting a given order. But I don&#39;t have a strong justification for doing so.

I am perfectly familiar with the definition of each trait, so please don&#39;t answer with defining the terms.

scala, guidelines on return type - when prefer seq, iterable, traversable

Is there a general way to define the size, in percent or pixels, for an image that is linked in `org-mode`?

Say I have the following link in my `.org` file:

    [[~/images/example.jpg]]

This JPG is way too large, so if I export it to HTML or LaTeX or open it in `org-mode` with &lt;kbd&gt;C-c C-o i&lt;/kbd&gt; will only see a fraction of the image. 

How to resize images in org-mode

I installed the elmah.mvc nuget package and kept the default configuration of that sans setting up sending an email and plugging it into a SQL database.

On my local machine when I use the Visual Studio host, I can open my app and access /elmah fine to see a report of the errors. However, when I try and access /elmah on production, I get two errors, first I get a `403 access is denied` server error. Then in my email (from elmah) I get:

    System.Web.HttpException: Server cannot set status after HTTP headers have been sent.

Anyone know what is going on here and how to fix? Thanks.

I tried the following so far as suggested by the answers below:

In `&lt;system.webServer&gt;`

    &lt;handlers&gt;
      &lt;add name=&quot;elmah&quot; verb=&quot;GET&quot; path=&quot;elmah.axd&quot; type=&quot;Elmah.ErrorLogPageFactory, Elmah&quot;/&gt;
    &lt;/handlers&gt;

And in `&lt;system.web&gt;`

    &lt;httpHandlers&gt;
    &lt;add verb=&quot;POST,GET,HEAD&quot; path=&quot;elmah.axd&quot; type=&quot;Elmah.ErrorLogPageFactory, Elmah&quot; /&gt;
    &lt;/httpHandlers&gt;

I tried setting the path to both `elmah.axd` and simply `~/elmah`. All still give the same error, and still works locally, but not in production.

**Edit:** It actually also works when I remote into the server and access it via browser on there (not using localhost, but the actual site address). So what permission am I not having? Seems like it&#39;s at the server level.

Can&#39;t access /elmah on production server with Elmah MVC?

I installed the elmah.mvc nuget package and kept the default configuration of that sans setting up sending an email and plugging it into a SQL database.
On my local machine when I use the Visual Studio host, I can open my app and access /elmah fine to see a report of the errors. However, when I try and access /elmah on production, I get two errors, first I get a <code>403 access is denied</code> server error. Then in my email (from elmah) I get:
<pre><code class="hljs language-arduino">System.Web.HttpException: Server cannot set status after HTTP headers have been sent.
</code></pre>
Anyone know what is going on here and how to fix? Thanks.
I tried the following so far as suggested by the answers below:
In <code>&#x3C;system.webServer></code>
<pre><code class="hljs language-php-template">&#x3C;handlers>
 &#x3C;add name="elmah" verb="GET" path="elmah.axd" type="Elmah.ErrorLogPageFactory, Elmah"/>
&#x3C;/handlers>
</code></pre>
And in <code>&#x3C;system.web></code>
<pre><code class="hljs language-php-template">&#x3C;httpHandlers>
&#x3C;add verb="POST,GET,HEAD" path="elmah.axd" type="Elmah.ErrorLogPageFactory, Elmah" />
&#x3C;/httpHandlers>
</code></pre>
I tried setting the path to both <code>elmah.axd</code> and simply <code>~/elmah</code>. All still give the same error, and still works locally, but not in production.
Edit: It actually also works when I remote into the server and access it via browser on there (not using localhost, but the actual site address). So what permission am I not having? Seems like it's at the server level.

I was wondering how I can achieve model validation with ASP.NET Web API. I have my model like so:

    public class Enquiry
    {
        [Key]
        public int EnquiryId { get; set; }
        [Required]
        public DateTime EnquiryDate { get; set; }
        [Required]
        public string CustomerAccountNumber { get; set; }
        [Required]
        public string ContactName { get; set; }
    }

I then have a Post action in my API Controller:

    public void Post(Enquiry enquiry)
    {
        enquiry.EnquiryDate = DateTime.Now;
        context.DaybookEnquiries.Add(enquiry);
        context.SaveChanges();
    }

How do I add `if(ModelState.IsValid)` and then handle the error message to pass down to the user?

Handle ModelState Validation in ASP.NET Web API

I am trying to add a photo to a Excel Spread sheet but keep getting the following error?

&gt; Error	1	Interop type &#39;Microsoft.Office.Interop.Excel.ApplicationClass&#39;
&gt; cannot be embedded. Use the applicable interface instead.

ApplicationClass(); is underlined in red in the line of code below:

&gt;  xlApp = new Excel.ApplicationClass();

Could Some on please tel me how i could fix this?

    using Excel = Microsoft.Office.Interop.Excel;
    using Microsoft.Office.Core;

    private void btnWriteSpreedSheet_Click(object sender, EventArgs e)
            {
                Excel.Application xlApp;
                Excel.Workbook xlWorkBook;
                Excel.Worksheet xlWorkSheet;
                object misValue = System.Reflection.Missing.Value;
    
                xlApp = new Excel.ApplicationClass(); //This is where the problem is??????
                xlWorkBook = xlApp.Workbooks.Add(misValue);
                xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
    
                //add some text 
                xlWorkSheet.Cells[1, 1] = &quot;http://csharp.net-informations.com&quot;;
                xlWorkSheet.Cells[2, 1] = &quot;Adding picture in Excel File&quot;;
    
                xlWorkSheet.Shapes.AddPicture(&quot;C:\\csharp-xl-picture.JPG&quot;, Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoCTrue, 50, 50, 300, 45);
     
                  xlWorkBook.SaveAs(&quot;csharp.net-informations.xls&quot;, Excel.XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
                xlWorkBook.Close(true, misValue, misValue);
                xlApp.Quit();
    
                releaseObject(xlApp);
                releaseObject(xlWorkBook);
                releaseObject(xlWorkSheet);
    
                MessageBox.Show (&quot;File created !&quot;);
            }
    
            private void releaseObject(object obj)
            {
                try
                {
                    System.Runtime.InteropServices.Marshal.ReleaseComObject(obj);
                    obj = null;
                }
                catch (Exception ex)
                {
                    obj = null;
                    MessageBox.Show(&quot;Unable to release the Object &quot; + ex.ToString());
                }
                finally
                {
                    GC.Collect();
                }
            } 
    
        }

Cannot be embedded. Use the applicable interface instead

I can&#39;t figure out the syntax to do inline collection initialization for:

    var a = new List&lt;KeyValuePair&lt;string, string&gt;&gt;();


How do you use object initializers for a list of key value pairs?

I would like to generate coupon codes , e.g. `AYB4ZZ2`. However, I would also like to be able to mark the used coupons and limit their global number, let&#39;s say `N`. The naive approach would be something like *&quot;generate `N` unique alphanumeric codes, put them into database and perform a db search on every coupon operation.&quot;*

However, as far as I realize, we can also **attempt to find a function** `MakeCoupon(n)`, which converts the given number into a coupon-like string with predefined length.

*As far as I understand, `MakeCoupon` should fullfill the following requirements:*

- Be bijective. It&#39;s inverse `MakeNumber(coupon)` should be effectively computable.

- Output for `MakeCoupon(n)` should be alphanumeric and should have small and **constant** length - so that it could be called *human readable*. E.g. `SHA1` digest wouldn&#39;t pass this requirement.

- Practical uniqueness. Results of `MakeCoupon(n)` for every natural `n &lt;= N` should be totally unique or unique in the same terms as, for example, `MD5` is unique (with the same extremely small collision probability).

- *(this one is tricky to define)* It shouldn&#39;t be obvious how to enumerate all remaining coupons from a single coupon code - let&#39;s say `MakeCoupon(n)` and `MakeCoupon(n + 1)` should visually differ.
&gt; E.g. `MakeCoupon(n),` which simply outputs `n` padded with zeroes would fail this requirement, because `000001` and `000002` don&#39;t actually differ &quot;visually&quot;.

Q:
--

**Does any function or function generator, which fullfills the following requirements, exist?** My search attempts only lead me to [`[CPAN]` CouponCode,][1] but it does not fullfill the requirement of the corresponding function being bijective.


  [1]: http://search.cpan.org/dist/Algorithm-CouponCode/lib/Algorithm/CouponCode.pm

Coupon code generation

I am trying to compile this code in Microsoft Visual C# 2010

    using System;
    using System.Globalization;


    class main
    {
        static void Main()
        {

            dynamic d;
            d = &quot;dyna&quot;;
            Console.WriteLine(d);    
        }
    }

but I am getting these two errors

_Error	1	Predefined type &#39;Microsoft.CSharp.RuntimeBinder.Binder&#39; is not defined or imported_

_Error 2        One or more types required to compile a dynamic expression cannot be found. Are you missing references to Microsoft.CSharp.dll and System.Core.dll?_

I read this other [post][1] but I am new to C# and I couldn&#39;t understand what really is the problem. Especially what and where are these so called `.config` files..


  [1]: https://stackoverflow.com/questions/7115055/why-am-i-getting-one-or-more-types-required-to-compile-a-dynamic-expression-can

One or more types required to compile a dynamic expression cannot be found. Are you missing references to Microsoft.CSharp.dll and System.Core.dll?

Is there a way for me to catch **all** incoming requests to my ASP.NET MVC 4 app and run some code before continuing the request onward to the specified controller/action?

I need to run some custom auth code with existing services, and to do this properly, I&#39;ll need to be able intercept all incoming requests from all clients to double check some things with the other service.

ASP.NET MVC 4 intercept all incoming requests

I have a project that requires my URLs have dots in the path. For example I may have a URL such as www.example.com/people/michael.phelps

URLs with the dot generate a 404. My routing is fine. If I pass in michaelphelps, without the dot, then everything works. If I add the dot I get a 404 error. The sample site is running on Windows 7 with IIS8 Express. URLScan is not running. 

I tried adding the following to my web.config:


    &lt;security&gt;
      &lt;requestFiltering allowDoubleEscaping=&quot;true&quot;/&gt;
    &lt;/security&gt;
  &lt;/system.webServer&gt;

Unfortunately that didn&#39;t make a difference. I just receive a 404.0 Not Found error. 

This is a MVC4 project but I don&#39;t think that&#39;s relevant. My routing works fine and the parameters I expect are there, until they include a dot.

What do I need to configure so I can have dots in my URL?

Dots in URL causes 404 with ASP.NET mvc and IIS

I am new to asp.net MVC so please bear with me. I need build a menu that repeats across multiple views. What would better serve the purpose [`Html.Action`][0] OR [`Html.Partial`][1].



[0]:http://msdn.microsoft.com/en-us/library/ee703423.aspx
[1]:http://msdn.microsoft.com/en-us/library/ee402898.aspx

MVC Html.Partial or Html.Action

I am using MVC C#.

Can somebody give an example on why one would use

    [HttpPost/HttpGet] 

for an Action. How can an active have both - what is the practical use? 

MVC [HttpPost/HttpGet] for Action

I want to build a **RESTful** web service using ASP.NET Web API that third-party developers will use to access my application&#39;s data.

I&#39;ve read quite a lot about **OAuth** and it seems to be the standard, but finding a good sample with documentation explaining how it works (and that actually does work!) seems to be incredibly difficult (especially for a newbie to OAuth). 

Is there a sample that actually builds and works and shows how to implement this?

I&#39;ve downloaded numerous samples:

 - DotNetOAuth - documentation is hopeless from a newbie perspective
 - Thinktecture - can&#39;t get it to build

I&#39;ve also looked at blogs suggesting a simple token-based scheme (like [this][1]) - this seems like re-inventing the wheel but it does have the advantage of being conceptually fairly simple.

It seems there are many questions like this on SO but no good answers.

What is everybody doing in this space? 


  [1]: http://codebetter.com/johnvpetersen/2012/04/02/making-your-asp-net-web-apis-secure/

How to secure an ASP.NET Web API

I am writing a small Java program to get the amount of results for a given Google search term. For some reason, in Java I am getting a 403 Forbidden but I am getting the right results in web browsers. Code:

    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.net.URL;
    
    
    public class DataGetter {
    
    	public static void main(String[] args) throws IOException {
    		getResultAmount(&quot;test&quot;);
    	}
    	
    	private static int getResultAmount(String query) throws IOException {
    		BufferedReader r = new BufferedReader(new InputStreamReader(new URL(&quot;https://www.google.com/search?q=&quot; + query).openConnection()
    				.getInputStream()));
            String line;
            String src = &quot;&quot;;
            while ((line = r.readLine()) != null) {
            	src += line;
            }
            System.out.println(src);
            return 1;
    	}
    
    }

And the error:

    Exception in thread &quot;main&quot; java.io.IOException: Server returned HTTP response code: 403 for URL: https://www.google.com/search?q=test
    	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
    	at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source)
    	at DataGetter.getResultAmount(DataGetter.java:15)
    	at DataGetter.main(DataGetter.java:10)

Why is it doing this?

403 Forbidden with Java but not web browser?

I was trying to __scrape__ a website for practice, but I kept on getting the HTTP Error 403 (does it think I&#39;m a bot)?

Here is my code:

    #import requests
    import urllib.request
    from bs4 import BeautifulSoup
    #from urllib import urlopen
    import re
    
    webpage = urllib.request.urlopen(&#39;http://www.cmegroup.com/trading/products/#sortField=oi&amp;sortAsc=false&amp;venues=3&amp;page=1&amp;cleared=1&amp;group=1&#39;).read
    findrows = re.compile(&#39;&lt;tr class=&quot;- banding(?:On|Off)&gt;(.*?)&lt;/tr&gt;&#39;)
    findlink = re.compile(&#39;&lt;a href =&quot;&gt;(.*)&lt;/a&gt;&#39;)
    
    row_array = re.findall(findrows, webpage)
    links = re.finall(findlink, webpate)
    
    print(len(row_array))
    
    iterator = []

The error I get is:

     File &quot;C:\Python33\lib\urllib\request.py&quot;, line 160, in urlopen
        return opener.open(url, data, timeout)
      File &quot;C:\Python33\lib\urllib\request.py&quot;, line 479, in open
        response = meth(req, response)
      File &quot;C:\Python33\lib\urllib\request.py&quot;, line 591, in http_response
        &#39;http&#39;, request, response, code, msg, hdrs)
      File &quot;C:\Python33\lib\urllib\request.py&quot;, line 517, in error
        return self._call_chain(*args)
      File &quot;C:\Python33\lib\urllib\request.py&quot;, line 451, in _call_chain
        result = func(*args)
      File &quot;C:\Python33\lib\urllib\request.py&quot;, line 599, in http_error_default
        raise HTTPError(req.full_url, code, msg, hdrs, fp)
    urllib.error.HTTPError: HTTP Error 403: Forbidden


Problem HTTP error 403 in Python 3 Web Scraping

I&#39;m running ubuntu 13.04 64bit on my desktop, I installed Apache2, MySQL and PHP etc.

I wanted to have my web root in `/home/afflicto/public_html` instead of `/var/www`.
So I went along with this guide:  
http://www.maketecheasier.com/install-and-configure-apache-in-ubuntu/2011/03/09  
(I did everything from &quot;configuring different sites&quot;) as I like the solution more.

**Here&#39;s what I did:**  
Installed Apache2, MySQL etc..  
copied `/etc/apache2/sites-avaliable/default` to `/etc/apache2/sites-available/afflicto`. Then edited it, it now looks like the following:

**/etc/apache2/sites-available/afflicto**  

    &lt;VirtualHost *:80&gt;
	ServerAdmin webmaster@localhost

	DocumentRoot /home/afflicto/public_html
	&lt;Directory /&gt;
		Options FollowSymLinks
		AllowOverride None
	&lt;/Directory&gt;
	&lt;Directory /home/afflicto/public_html/&gt;
		Options Indexes FollowSymLinks MultiViews
		AllowOverride All
		Order allow,deny
		allow from all
	&lt;/Directory&gt;

	ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
	&lt;Directory &quot;/usr/lib/cgi-bin&quot;&gt;
		AllowOverride None
		Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
		Order allow,deny
		Allow from all
	&lt;/Directory&gt;

	ErrorLog ${APACHE_LOG_DIR}/error.log

	# Possible values include: debug, info, notice, warn, error, crit,
	# alert, emerg.
	LogLevel warn

	CustomLog ${APACHE_LOG_DIR}/access.log combined
    &lt;/VirtualHost&gt;  

I did `sudo a2dissite default &amp;&amp; sudo a2ensite afflicto &amp;&amp; sudo service apache2 restart`  

I created a `index.php` and `index.html` in `/home/afflicto/public_html/test/`  
when accessing `localhost/test` or `localhost/test/index.html` etc, I get 403 forbidden error.  

What am I doing wrong? thanks in advance.

**update 1**  
I have set the owner of the public_html directory to `www-data`.  
Also `sudo chmod -R +x public_html &amp;&amp; sudo chmod -R 777 public_html`  
Still same 403 error.

Here&#39;s the output of the apache error log:  

    [Sun Jul 14 06:10:32 2013] [error] [client 127.0.0.1] (13)Permission denied: access to / denied

    [Sun Jul 14 06:10:32 2013] [error] [client 127.0.0.1] (13)Permission denied: access to /favicon.ico denied

Apache2 virtualhost 403 forbidden?

I have 3 domain names and am trying to host all 3 sites on one server (a Digital Ocean droplet) using Nginx.

mysite1.name
mysite2.name
mysite3.name

Only 1 of them works.  The other two result in 403 errors (in the same way).

In my nginx error log, I see: `[error] 13108#0: *1 directory index of &quot;/usr/share/nginx/mysite2.name/live/&quot; is forbidden`.

My sites-enabled config is:

    server {
            server_name www.mysite2.name;
            return 301 $scheme://mysite2.name$request_uri;
    }
    server {
            server_name     mysite2.name;
    
            root /usr/share/nginx/mysite2.name/live/;
            index index.html index.htm index.php;
    
            location / {
                    try_files $uri $uri/ /index.html index.php;
            }
    
            location ~ \.php$ {
                    fastcgi_split_path_info ^(.+\.php)(/.+)$;
                    fastcgi_pass unix:/var/run/php5-fpm.sock;
                    fastcgi_index index.php;
                    include fastcgi_params;
            }
    }

All 3 sites have nearly identical config files.

Each site&#39;s files are in folders like /usr/share/nginx/mysite1.name/someFolder, and then /usr/share/nginx/mysite1.name/live is a symlink to that. (Same for mysite2 and mysite3.)

I&#39;ve looked at https://stackoverflow.com/questions/6795350/nginx-403-forbidden-for-all-files?rq=1 but that didn&#39;t help. 

Any ideas on what might be wrong?

Nginx 403 error: directory index of [folder] is forbidden

I have Nginx setup and displaying the test page properly. If I try to change the root path, I get a 403 Forbidden error, even though all permissions are identical. Additionally, the nginx user exists.

nginx.conf:

    user nginx;
    worker_processes  1;
    
    error_log  /var/log/nginx/error.log;
    
    pid        /run/nginx.pid;
    
    events {
        worker_connections  1024;
    }
    
    http {
        index   index.html index.htm;
    
        server {
            listen       80;
            server_name  localhost;
            root         /var/www/html; #changed from the default /usr/share/nginx/html
        }
    }

namei -om /usr/share/nginx/html/index.html

    f: /usr/share/nginx/html/index.html
    dr-xr-xr-x root root /
    drwxr-xr-x root root usr
    drwxr-xr-x root root share
    drwxr-xr-x root root nginx
    drwxr-xr-x root root html
    -rw-r--r-- root root index.html

namei -om /var/www/html/index.html

    f: /var/www/html/index.html
    dr-xr-xr-x root root /
    drwxr-xr-x root root var
    drwxr-xr-x root root www
    drwxr-xr-x root root html
    -rw-r--r-- root root index.html

error log

&gt; 2014/03/23 12:45:08 [error] 5490#0: *13 open()
&gt; &quot;/var/www/html/index.html&quot; failed (13: Permission denied), client:
&gt; XXX.XX.XXX.XXX, server: localhost, request: &quot;GET /index.html HTTP/1.1&quot;, host: &quot;ec2-XXX-XX-XXX-XXX.compute-1.amazonaws.com&quot;

Content Type	Original Author	Original Content on Stackoverflow
Question	SventoryMang	View Question on Stackoverflow
Solution 1 - C#	Paige Cook	View Answer on Stackoverflow
Solution 2 - C#	scottm	View Answer on Stackoverflow

Can't access /elmah on production server with Elmah MVC?

C# Problem Overview

C# Solutions

Solution 1 - C#

Solution 2 - C#

How to resize images in org-mode

scala, guidelines on return type - when prefer seq, iterable, traversable

Attributions