http://curl.haxx.se/libcurl/c/curl_easy_getinfo.html

&lt;pre&gt;
CURLINFO_RESPONSE_CODE

Pass a pointer to a long to receive the last received HTTP or FTP code. This
option was known as CURLINFO_HTTP_CODE in libcurl 7.10.7 and earlier. This 
will be zero if no server response code has been received. Note that a 
proxy&#39;s CONNECT response should be read with CURLINFO_HTTP_CONNECTCODE 
and not this. 
&lt;/pre&gt;


	curl_code = curl_easy_perform (session);
	long http_code = 0;
	curl_easy_getinfo (session, CURLINFO_RESPONSE_CODE, &amp;http_code);
	if (http_code == 200 &amp;&amp; curl_code != CURLE_ABORTED_BY_CALLBACK)
	{
             //Succeeded
	}
	else
	{
             //Failed
	}




The other answer is absolutely correct, but I would also like to add that it might not be wise to check the error code by hand, the `200` code is not the only code that signifies success.

I&#39;d recoment using the libcurl option [CURLOPT_FAILONERROR](https://curl.haxx.se/libcurl/c/CURLOPT_FAILONERROR.html) that when activated will make libcurl consider `400` and `500` -category statuses a request failure and will not return `CURLE_OK` from perform.


I&#39;m trying to trouble shoot a web service client in my current project.  I&#39;m not sure of the platform of the Service Server (Most likely LAMP).  I believe there is a fault on their side of the fence as i have eliminated the potential issues with my client.  The client is a standard ASMX type web reference proxy auto generated from the service WSDL.

What I need to get to is the RAW SOAP Messages (Request and Responses)

What is the best way to go about this?

Getting RAW Soap Data from a Web Reference Client running in ASP.net

What is the proper way to terminate a Swing application from the code, and what are the pitfalls?

I&#39;d tried to close my application automatically after a timer fires. But just calling `dispose()` on the `JFrame` didn&#39;t do the trick - the window vanished but the application did not terminate. However when closing the window with the close button, the application does terminate. What should I do?

How to close a Java Swing application from the code

How do I get the HTTP status code (eg 200 or 500) after calling curl\_easy\_perform?  

Http status code with libcurl?

<p>How do I get the HTTP status code (eg 200 or 500) after calling curl_easy_perform?</p>


How can I pad a string with spaces on the left when using printf?

For example, I want to print &quot;Hello&quot; with 40 spaces preceding it.

Also, the string I want to print consists of multiple lines.  Do I need to print each line separately?

EDIT: Just to be clear, I want exactly 40 spaces printed before every line.

Left-pad printf with spaces

We had a discussion here at work regarding why _fread()_ and _fwrite()_ take a size per member and count and return the number of members read/written rather than just taking a buffer and size. The only use for it we could come up with is if you want to read/write an array of structures which aren&#39;t evenly divisible by the platform alignment and hence have been padded but that can&#39;t be so common as to warrant this choice in design.

From [fread(3)](https://man7.org/linux/man-pages/man3/fread.3.html):

&gt;The function fread() reads nmemb elements of data, each size bytes long,
&gt;from the stream pointed to by stream, storing them at the location given
&gt;by ptr.
    
&gt;The  function  fwrite()  writes  nmemb elements of data, each size bytes
&gt;long, to the stream pointed to by stream, obtaining them from the location
&gt;given by ptr.
    
&gt;fread() and fwrite() return the number of items successfully read or written
&gt;(i.e., not the number of characters).  If an error occurs, or  the
&gt;end-of-file is reached, the return value is a short item count (or zero).

What is the rationale for fread/fwrite taking size and count as arguments?

I&#39;m learning about Win32 programming, and the `WinMain` prototype looks like:

    int WINAPI WinMain ( HINSTANCE instance, HINSTANCE prev_instance, PSTR cmd_line, int cmd_show )

I was confused as to what this `WINAPI` identifier was for and found:

    #define WINAPI      __stdcall

What does this do?  I&#39;m confused by this having something at all after a return type.  What is `__stdcall` for?  What does it mean when there is something between the return type and function name?

   


What is __stdcall?

I&#39;m making a C program where I need to get the directory that the program is started from.  This program is written for UNIX computers. I&#39;ve been looking at `opendir()` and `telldir()`, but `telldir()` returns a `off_t (long int)`, so it really doesn&#39;t help me. 

How can I get the current path in a string (char array)?

How to get the current directory in a C program?

I&#39;m looking for an implementation of CRC32 in C or C++ that is explicitly licensed as being no cost or public domain.  The implementation [here][1] seems nice, but the only thing it says about the license is &quot;source code&quot;, which isn&#39;t good enough.  I&#39;d prefer non LGPL so I don&#39;t have to fool around with a DLL (my app is closed source).  I saw the adler32 implementation in zlib, but I&#39;m checking small chunks of data, which adler is not good for.  

  [1]: http://www.networkdls.com/Software/View/CRC32

CRC32 C or C++ implementation

When issuing an HTTP DELETE request, the request URI should completely identify the resource to delete. However, is it allowable to add extra meta-data as part of the entity body of the request?

Is an entity body allowed for an HTTP DELETE request?

I&#39;m trying to test the functionality of a web app by scripting a login sequence in Python, but I&#39;m having some troubles.

Here&#39;s what I need to do:

1. Do a POST with a few parameters and headers.
2. Follow a redirect
3. Retrieve the HTML body.

Now, I&#39;m relatively new to python, but the two things I&#39;ve tested so far haven&#39;t worked. First I used httplib, with putrequest() (passing the parameters within the URL), and putheader(). This didn&#39;t seem to follow the redirects.

Then I tried urllib and urllib2, passing both headers and parameters as dicts. This seems to return the login page, instead of the page I&#39;m trying to login to, I guess it&#39;s because of lack of cookies or something.

Am I missing something simple?

Thanks.

Python: urllib/urllib2/httplib confusion

I&#39;d like some advice on designing a REST API which will allow clients to add/remove large numbers of objects to a collection efficiently.

Via the API, clients need to be able to add items to the collection and remove items from it, as well as manipulating existing items. In many cases the client will want to make bulk updates to the collection, e.g. adding 1000 items and deleting 500 different items. It feels like the client should be able to do this in a single transaction with the server, rather than requiring 1000 separate POST requests and 500 DELETEs. 

Does anyone have any info on the best practices or conventions for achieving this?

My current thinking is that one should be able to PUT an object representing the change to the collection URI, but this seems at odds with the [HTTP 1.1 RFC][1], which seems to suggest that the data sent in a PUT request should be interpreted independently from the data already present at the URI. This implies that the client would have to send a complete description of the new state of the collection in one go, which may well be very much larger than the change, or even be more than the client would know when they make the request.

Obviously, I&#39;d be happy to deviate from the RFC if necessary but would prefer to do this in a conventional way if such a convention exists.

  [1]: http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html#sec9.6

Bulk Collection Manipulation through a REST (RESTful) API

Which is the best method to make the browser use cached versions of js files (from the serverside)?

caching JavaScript files

This might be a silly question:

- Does HTTP ever use the User Datagram Protocol? 

**For example:** 

&gt; If one is streaming MP3 or video  using HTTP,  does it internally use UDP for transport?

Does HTTP use UDP?

I&#39;m using a simple PHP library to add documents to a SOLR index, via HTTP.  

There are 3 servers involved, currently:

 1. The PHP box running the indexing job
 2. A database box holding the data being indexed
 3. The solr box.

At 80 documents/sec (out of 1 million docs), I&#39;m noticing an unusually high interrupt rate on the network interfaces on the PHP and solr boxes (2000/sec; what&#39;s more, the graphs are nearly identical -- when the interrupt rate on the PHP box spikes, it also spikes on the Solr box), but much less so on the database box (300/sec).  I imagine this is simply because I open and reuse a single connection to the database server, but every single Solr request is currently opening a new HTTP connection via cURL, thanks to the way the Solr client library is written.

So, my question is:

 1. Can cURL be made to open a keepalive session?  
 2. What does it take to reuse a connection?  -- is it as simple as reusing the cURL handle resource?
 3. Do I need to set any special cURL options?  (e.g. force HTTP 1.1?)
 4. Are there any gotchas with cURL keepalive connections?  This script runs for hours at a time; will I be able to use a single connection, or will I need to periodically reconnect?



Persistent/keepalive HTTP with the PHP Curl library?

I&#39;m trying to import `pycurl`:

    $ python -c &quot;import pycurl&quot;
    Traceback (most recent call last):
    File &quot;&lt;string&gt;&quot;, line 1, in &lt;module&gt;
    ImportError: libcurl.so.4: cannot open shared object file: No such file or directory

Now, `libcurl.so.4` is in `/usr/local/lib`. As you can see, this is in `sys.path`:

    $ python -c &quot;import sys; print(sys.path)&quot;
    [&#39;&#39;, &#39;/usr/local/lib/python2.5/site-packages/setuptools-0.6c9-py2.5.egg&#39;, 
    &#39;/usr/local/lib/python25.zip&#39;, &#39;/usr/local/lib/python2.5&#39;, 
    &#39;/usr/local/lib/python2.5/plat-linux2&#39;, &#39;/usr/local/lib/python2.5/lib-tk&#39;, 
    &#39;/usr/local/lib/python2.5/lib-dynload&#39;, 
    &#39;/usr/local/lib/python2.5/sitepackages&#39;, &#39;/usr/local/lib&#39;, 
    &#39;/usr/local/lib/python2.5/site-packages&#39;]


Any help will be greatly appreciated.

Why can&#39;t Python find shared objects that are in directories in sys.path?

I have a django view that returns HTTP 301 on a curl request:

    grapefruit:~ pete$ curl -I http://someurl
    HTTP/1.1 301 MOVED PERMANENTLY
    Date: Fri, 16 Oct 2009 19:01:08 GMT
    Server: Apache/2.2.9 (Win32) mod_wsgi/2.5 Python/2.6.2 PHP/5.2.6
    Location: http://someurl
    Content-Type: text/html; charset=utf-8



 I can&#39;t get the page&#39;s content from curl. However, if I visit the page with a browser, I see the content as expected.

Any ideas?

Thanks,
Pete

Django returning HTTP 301?

I am building an application (on windows using Dev-C++) and I want it to download a file. I am doing this using libcurl (I have already installed the source code using packman). I found a working example (http://siddhantahuja.wordpress.com/2009/04/12/how-to-download-a-file-from-a-url-and-save-onto-local-directory-in-c-using-libcurl/) but it doesn&#39;t close the file after download is complete. I would like someone to give an example on how to download a file, either in c or c++. Thanks in advance!

Download file using libcurl in C/C++

I want to store the result of this curl function in a variable, how can I do so?

    #include &lt;stdio.h&gt;
    #include &lt;curl/curl.h&gt;
    
    int main(void)
    {
      CURL *curl;
      CURLcode res;
    
      curl = curl_easy_init();
      if(curl) {
        curl_easy_setopt(curl, CURLOPT_URL, &quot;curl.haxx.se&quot;);
        res = curl_easy_perform(curl);
    
        /* always cleanup */
        curl_easy_cleanup(curl);
      }
      return 0;
    }

thanks, I solved it like this:

    #include &lt;stdio.h&gt;
    #include &lt;stdlib.h&gt;
    #include &lt;curl/curl.h&gt;
    
    function_pt(void *ptr, size_t size, size_t nmemb, void *stream){
        printf(&quot;%d&quot;, atoi(ptr));
    }
    
    int main(void)
    {
      CURL *curl;
      curl = curl_easy_init();
      if(curl) {
        curl_easy_setopt(curl, CURLOPT_URL, &quot;curl.haxx.se&quot;);
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, function_pt);
        curl_easy_perform(curl);
        curl_easy_cleanup(curl);
      }
      system(&quot;pause&quot;);
      return 0;
    }



Content Type	Original Author	Original Content on Stackoverflow
Question	twk	View Question on Stackoverflow
Solution 1 - C	Vinko Vrsalovic	View Answer on Stackoverflow
Solution 2 - C	kralyk	View Answer on Stackoverflow

Http status code with libcurl?

C Problem Overview

C Solutions

Solution 1 - C

Solution 2 - C

How to close a Java Swing application from the code

Getting RAW Soap Data from a Web Reference Client running in ASP.net

Attributions