I have a controller in CodeIgniter which have few functions in it. For ajax interaction, in some functions where i had to return json objects, i did the following :
$this->output->set_content_type("application/json");
The ajax is working fine. But now when i'm trying to echo something from a function and going to that function in browser gives me the following :
Content Encoding Error
The page you are trying to view cannot be shown because it uses an invalid or unsupported form of compression.
I tried setting content type to "text/html", i don't know. Also i tried removing all those content type set. That also didn't help me echoing out of the controller.
What should i do, to echo something out of a specific controller function just in case for testing purposes?
You seem to have GZIP compression turned on in your config. it might mess with your AJAX transfers and/or caching.
By default you don't need to give a content-type when serving json encoded data. So it's better to leave the whole content-type out to prevent future issues. Besides that it's also handy because there can be occasions where you might have one AJAX call give either a JSON encoded string or just a piece of output.
Good luck!
Related
I tryied searching for this and I belive I alredy know the answer but it's crusal that I'm not wrong, so here I go..
When calling get_headers, will I retrieve the whole file even though the function only returns the headers or will it retrieve, as expected, only the headers and nothing else?
I'm guessing the last but if I'm wrong this will cause some serious problems..
Also I noticed that there is a global setting I can change to send a HEAD request instead of the default GET request, witch is why I'm asking my self whats really going on.
Edit
Maybe this function is a better alternative? stream_get_meta_data or do they actually do the same thing?
You could also take a look at the source code, if you are familiar with C.
The function is defined here. I quickly looked over this, and it seems it is a header-only request, see line 715:
STREAM_ONLY_GET_HEADERS
GET
Requests a representation of the specified resource. Requests using
GET should only retrieve data and should have no other effect. (This
is also true of some other HTTP methods.) The W3C has published
guidance principles on this distinction, saying, "Web application
design should be informed by the above principles, but also by the
relevant limitations."
HEAD
Asks for the response identical to the one that would correspond to a
GET request, but without the response body. This is useful for
retrieving meta-information written in response headers, without
having to transport the entire content.
Wikipedia/Hypertext_Transfer_Protocol
The PHP-docs clearly states that normal get_headers() uses a GET-request, but you can force it to use HEAD instead, like this:
<?php
// By default get_headers uses a GET request to fetch the headers. If you
// want to send a HEAD request instead, you can do so using a stream context:
stream_context_set_default(
array(
'http' => array(
'method' => 'HEAD'
)
)
);
$headers = get_headers('http://example.com');
?>
Unfortunaley you're right, just read the PHP manual:
get_headers() returns an array with the headers sent by the server in response to a HTTP request.
Also take a look at the examples.
Okay, next time I should spend more attention to the question formulation.
Yeh, if the request type is set to GET (standard) you will get the whole content. You could change it to HEAD, but this is not what you want.
OS: Windows 7 (64-Bit)WAMP Version: 2.2Apache Version: 2.2.22PHP
Version: 5.4.3Framework: CodeIgniter 2.1.2
Hi, I am experiencing something strange, and can't seem to pinpoint the cause. I am sending a js object to server to be saved in db in BLOB. The object is converted to JSON string using JSON.stringify() before sending it in Ajax(POST) call.
Object After Using JSON.stringify
[{"page_id":"1","site_id":456,"composite_id":"456-1-text-1","type":"2","properties":"{\"id\":\"text-1\",\"isModified\":false,\"isNew\":false,\"name\":\"Text 1\",\"content\":\"<span style=\\\"text-decoration:underline;font-size:x-large;color:#7092be;background-color:#c8bfe7;\\\"><strong>Your text here</strong></span>\",\"keywords\":\"\",\"top\":103,\"left\":119,\"width\":130,\"height\":30,\"style\":{\"borderColor\":\"#1e07da\",\"borderSize\":\"2\",\"borderRadius\":\"6\",\"shadowType\":\"drop-shadow\",\"shadowColor\":\"#000000\",\"shadowSize\":\"0\",\"shadowBlur\":\"0\",\"boxShadowColor\":\"#000000\",\"boxShadowPosX\":\"3\",\"boxShadowPosY\":\"2\",\"boxShadowBlur\":\"5\",\"boxShadowType\":\"\",\"zIndex\":2020}}"}]
This is the concerning part from above string that gets modified(Key-Value Pair):
\"content\":\"<span style=\\\"text-decoration:underline;font-size:x-large;color:#7092be;background-color:#c8bfe7;\\\"><strong>Your text here</strong></span>\"
I send this string to api controller using ajax. When I receive it in the controller I use print_r() to print the variable. But now insted of the above mentioned part this is what I receive:
[{"page_id":"1","site_id":456,"composite_id":"456-1-text-1","type":"2","properties":"{\"id\":\"text-1\",\"isModified\":false,\"isNew\":false,\"name\":\"Text 1\",\"content\":\"<span ><strong><em>Your text here</em></strong></span>\",\"keywords\":\"\",\"top\":103,\"left\":119,\"width\":130,\"height\":30,\"style\":{\"borderColor\":\"#1e07da\",\"borderSize\":\"2\",\"borderRadius\":\"6\",\"shadowType\":\"drop-shadow\",\"shadowColor\":\"#000000\",\"shadowSize\":\"0\",\"shadowBlur\":\"0\",\"boxShadowColor\":\"#000000\",\"boxShadowPosX\":\"3\",\"boxShadowPosY\":\"2\",\"boxShadowBlur\":\"5\",\"boxShadowType\":\"\",\"zIndex\":2020}}"}]
As you can see the concerned part is missing the style settings and is now modified to:
\"content\":\"<span ><strong><em>Your text here</em></strong></span>\"
I have been searching it over the internet, but it does not seem to be a common problem as I cant find anything related to it. So now I am counting on SO.
Regards
UPDATE:
I used var_dump($_REQUEST)as suggested by #BogdanBurim. And this is the concerned part:
\"content\":\"<span style=\\\"text-decoration:underline;font-size:x-large;color:#7092be;background-color:#c8bfe7;\\\"><strong>Your text here</strong></span>\"
As you can see the style settings are still there. So with we come to the decision that CI filters might be removing this part from string. So now the question is how to fix this issue?
Well after discussion with #BogdanBurim, I came to conclusion that to avoid XSS to some extent CI removed any text included within quotes and double quotes, from data sent to server.
There was an option to extend CI_Input library to allow selective disabling of XSS filter. That would solve my issue but would raise security concerns. So instead what I did is I encode (base_64) the data before sending it to the api. It is saved in DB as BLOB. And when fetched is decoded on client side.
I'am building simple Ajax application (via jquery). I have strange issue. I found where the problem is, but I don't know how to solve it.
This is simple server-side php code:
<?php
require('some.php');
$return['pageContent'] = 'test';
echo(json_encode($return));
?>
On the client side, the error "Invalid JSON" is thrown.
I have discovered that if I delete require function, everything work fine.
Just for information, the "some.php" is an empty php file. There is no error when I open direct php files.
So, conclusion: I cant use require or include function if I want to use ajax?
Use Firebug to see what you're actually getting back during the AJAX call. My guess is that there's a PHP error somewhere, so you're getting more than just JSON back from the call (Firebug will show you that). As for your conclusion: using include/require by itself has absolutely no effect on the AJAX call (assuming there are no errors).
Try changing:
<?php
require('some.php');
$return['pageContent'] = 'test';
echo(json_encode($return));
?>
To:
<?php
$return = array(
'pageContent' => 'test'
);
echo json_encode($return);
?>
The problem might have to do with $return not being declared as an array prior to use.
Edit: Alright, so that might not be the problem at all. But! What might be happening is you might be echoing out something in the response. For example, if you have an error echoing out prior to the JSON, you'd be unable to parse it on the client.
if the "some.php" is an empty php file, why do you require it at all?!
require function throws a fatal error if it could't require the file. try using include function instead and see what happens, if it works then you probably have a problem with require 'some.php';
A require call won't have any effect. You need to check your returned output in Firebug. If using Chrome there is a plugin called Simple REST Client. https://chrome.google.com/extensions/detail/fhjcajmcbmldlhcimfajhfbgofnpcjmb through which you can quickly query for stuff.
Also, it's always good to send back proper HTTP headers with your response showing the response type.
It's most likely the BOM as has been discussed above. I had the same problem multiple times and used Fiddler to check the file in hex and noticed an extra 3 bytes that didn't exist in a prior backup and in new files I created. Somehow my original files were getting modified by Textpad (both in Windows). Although when I created them in Notepad++ I was fine.
So make sure that you have your encoding and codepages set up properly when you create, edit, and save your files in addition to keeping that consistent across OSes if you're developing on windows let's say and publishing to a linux environment at your hosting provider.
i hope you can cast some light on my problem. I need to do an AJAX / PHP / MYSQL application to display posts and stuff on the page i'm writing.
I only discovered how to do some simple stuff in PHP after taking some mushrooms but that was years ago and now i don't have mushrooms and i'm just stuck!
So here's the problem:
i think i need to send a proper "xml" file through php so the ajax part can take it but: when i try to put the header on top of the php it displays this error:
" Extra content at the end of the document "
When i looked at some tutorials people were using the "header" fearlesly to do such stuff as i want to do and no comments suggested that it didn't work. so why it doesn't work on my local server?
I'm running:
WAMP
Apache 2.2.11
PHP 5.3.0
It also doesn't work on a remote server (PHP 5.3.0) :/
I read all the stuff i could find till 5am and decided to ask you for help for the first time :)
Thank you!
header('content-type: application/xhtml+xml; charset=utf-8');
require_once("allyouneed.php");
require_once("bazingablob.php");
$category=$_GET["category"];
$post_tags=$_GET["post_tags"];
$language=$_GET["language"];
$author=$_GET["author"];
$posts_per_page=$_GET["posts_per_page"];
$current_page=$_GET["current_page"];
$order=$_GET["order"];
$hard_limit=$_GET["hard_limit"];
$show_hidden=$_GET["show_hidden"];*/
$wypluj="";
$wypluj="<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>";
$bazinga_blob = new bazingablob;
if (!$bazinga_blob->connect_to_database())
{
$wypluj.="<IsOK>0</IsOK>";
echo $wypluj;
exit;
}
else
{
$wypluj.="<IsOK>jedziem</IsOK>";
}
$bb_result=$bazinga_blob->get_all_posts($category,$post_tags,$language,$author,$posts_per_page,$current_page,$order,$hard_limit,$show_hidden);
if ($bb_result) //udalo sie cos znalezc w bazie wedlug kryteriow
{
$wypluj.="<Pagination>";
$wypluj.="<CurrentPage>";
$wypluj.=$bazinga_blob->posts_pagination["current_page"];
$wypluj.="</CurrentPage>";
$wypluj.="<LastPage>";
$wypluj.=$bazinga_blob->posts_pagination["last_page"];
$wypluj.="</LastPage>";
$wypluj.="<PostsCount>";
$wypluj.=$bazinga_blob->posts_pagination["posts_count"];
$wypluj.="</PostsCount>";
$wypluj.="</Pagination>";
$wypluj.="<Posts>";
foreach ($bb_result as $item)
{
$wypluj.="<Post>";
$wypluj.="<PostId>".$item->post_id."</PostId>";
$wypluj.="<PostAuthor>".$item->post_author."</PostAuthor>";
$wypluj.="<PostLangId>".$item->post_langid."</PostLangId>";
$wypluj.="<PostSlug>".$item->post_slug."</PostSlug>";
$wypluj.="<PostTitle>".$item->post_title."</PostTitle>";
$wypluj.="<PostGreetingPicture>".$item->post_greeting_picture."</PostGreetingPicture>";
$wypluj.="<PostGreetingVideo>".$item->post_greeting_video."</PostGreetingVideo>";
$wypluj.="<PostGreetingSound>".$item->post_greeting_sound."</PostGreetingSound>";
$wypluj.="<PostShort>".$item->post_short."</PostShort>";
$wypluj.="<PostBody>".$item->post_body."</PostBody>";
$wypluj.="<PostDate>".$item->post_date."</PostDate>";
$wypluj.="<PostPublished>".$item->post_published."</PostPublished>";
$wypluj.="<PostSticky>".$item->post_sticky."</PostSticky>";
$wypluj.="<PostComments>".$item->post_comments."</PostComments>";
$wypluj.="<PostProtected>".$item->post_protected."</PostProtected>";
$wypluj.="</Post>";
}
$wypluj.="</Posts>";
}
echo $wypluj;
The error comes from your browser and indicates that your XML is malformed.
Setting the application/xhtml+xml header tells the browser to process the document as serious XML. XML needs to be "well-formed", i.e. it must not contain any syntax errors. Apparently you do have a syntax error on line 1 at column 73, which makes the browser abort the attempt to process the document.
For this reason it's a pain to hand-code XML, you should really look into a library that takes care of the well-formedness for you, like PHP's own XMLWriter.
Have you validated your XML?
http://friendsofed.infopop.net/4/OpenTopic?a=tpc&s=989094322&f=5283032876&m=4521066061
I'm honestly not sure what you're trying to do with the header, it's not any Ajax method I've ever been taught. The header method you're doing looks just a few lines short of outputting the XML to a download prompt.
Here's my favorite way to do AJAX. Simple, understandable, and quick.
Include Jquery.
Setup your data--whether by form with a Serialize (gets form data into a Javascript Variable) or by just setting some variables as it seems you're doing above.
Send via Jquery Ajax to a separate processing page. The page will receive the data you setup as a $_REQUEST variable, with the method depending on whether you defined it as a POST or not (defaults to a GET)
The processing page --does-- stuff with the REQUEST data and may or may not respond back to the page. This is where you can do stuff like update divs, alert that it worked, etc.
Here's a great tutorial. Focus on the code under "Hello Ajax, Meet Jquery"
If you get yourself any more of those mushrooms, a PHP familiar way to do AJAX is with XAJAX. It allows you to do asynchronous calls to PHP functions. Be aware, though, that the forums are not the most english-friendly and documentation is a bit cryptic.
iam using json object in my php file but i dont want my json object to be displayed in source code as it increases my page size a lot.
this is what im doing in php
$json = new Services_JSON();
$arr = array();
$qs=mysql_query("my own query");
while($obj = mysql_fetch_object($qs))
{
$arr[] = $obj;
}
$total=sizeof($arr);
$jsn_obj='{"abc":'.$json->encode($arr).',"totalrow":"'.$total.'"}';
and this is javascript
echo '<script language=\'javascript\'>
var dataref = new Object();
dataref = eval('.$jsn_obj.');
</script>';
but i want to hide this $jsn_obj objects value from my source,how can i do that??? plz help !!
I'm not sure there's a way around your problem, other than to change your mind about whether it's a problem at all (it's not, really).
You can't use the JSON object in your page if you don't output it. The only other way to get the object would be to make a separate AJAX request for it. If you did it that way, you're still transferring the exact same number of bytes that you would have originally, but now you've added the overhead of an extra HTTP request (which will be larger than it would have been originally, since there are now HTTP headers on the transfer). This way would also be slower on your page load, since you'd have to load the page, then send the AJAX request and run the result.
There's much better ways to manage the size of your pages. JSON is just text, so you should look into a server-side solution to zip your content, like mod_deflate. mod_deflate works beautifully on dynamic PHP output as well as static pages. If you don't have control over your web server, you could use PHP's built in zlib compression.
Instead of writing the JSON date directly to the document instead you can use an XMLHttpRequest in or use a library like JQuery to load the JSON data during script runtime.
It depends largely on your json data. If the data you're printing inline in the html is huge you might wanna consider using ajax to load the json data. That is assuming you wanted your page to be loaded faster, even without data.
If the data isn't that big, try to keep the data inline, without making extra http requests. To speed up your page, try using YSlow! to see what other areas you could optimize.