I use RestSharp in my Windows Phone 7.1 project.
My problem is RestSharp always cache response data.
Example:
At the first time I send request, it returns data correctly. After some delete operations, I send that request again, but response seems the same as the first time, nothing's changed.
If I stop debugging and press F5 to start again, it works perfectly as expected.
I also tried request.AddParameter("cache-control", "no-cache", ParameterType.HttpHeader); and got no luck.
How can I fix this problem?
I have the same issue so just add header that specify not to cache response data
client is my RestClient with base url and than add default header Cache-Control with value no-cache.
client.AddDefaultHeader("Cache-Control", "no-cache")
I found solution in Rico Suter comment, thanks! I will mark this as accepted anwser
its a hack but try something like url = originalUrl + "&nocache=" + DateTime.Now.Ticks
The "Cache-Control" header should do the trick!
I think HTTP Headers are case-insensitive, but the server may not agree with me there! You should try using Cache-Control instead of cache-control...
Also, I would also add the Pragma header with no-cache value to the request (some old servers don't use the "Cache-Control" header, but they will sure recognize this one)!
And I would try to use Fiddler to debug the comms and check that the headers are really being sent to the server as expected!
Another solution can be to set the "If-Modified-Since" header with value of DateTime.Now:
client.AddDefaultParameter("If-Modified-Since", DateTime.Now, ParameterType.HttpHeader);
Related
I want to improve my experience with the internet by caching static content like images(jpg,png,gif) and fonts. Because always happens that when watching a webpage with a lot of images, and then I refresh with F5, the same contents are downloaded again.
I know that it's because the response headers could contain no cache o max-age 0, and even sometimes it happens when there is no cache o max-age in the response.
But in case of images or fonts that never change, it's useless to get max-age 0. So I wanted to know if there is a way to override the response headers and set them with max-age 1 year. Maybe with a chrome extension?
Yes you can do this by using a Chrome Extension. See this Change HTTP Headers chrome extension already does it.
For your specific case, you just need to do this:
Add an event listener which should be called whenever headers are received.
Read the details of the headers
Check if response content type is image
Add/Update the desired header to the headers
To accomplish this you can use webRequest Headers Received event.
Documentation of onHeadersReceived
onHeadersReceived (optionally synchronous): Fires each time that an HTTP(S) response header is received. Due to redirects and authentication requests this can happen multiple times per request. This event is intended to allow extensions to add, modify, and delete response headers, such as incoming Set-Cookie headers.
Your code will look something like this
chrome.webRequest.onHeadersReceived.addListener(function(details){
for(var i = 0; i < details.responseHeaders.length; i++) {
// If response is of image, add the cache-control header
}
return {responseHeaders: details.responseHeaders};
},
{urls: ['https://*/*'], types: ['image'] },
['blocking', 'responseHeaders']);
PS: I have not run and tested the code so please excuse the typos.
EDIT (After #RobW comment)
No, this is not possible as of now (22 march 2014). Adding Cache-control has no influence on the caching behavior. Check out this answer for more details.
Albeit this is an old question, I stumbled upon it recently. Later I found the chrome extension "Speed-Up Browsing" which seems to do exactly what the OP asked for.
For me it worked.
https://chrome.google.com/webstore/detail/speed-up-browsing/hkhnldpdljhiooeallkmlajnogjghdfb?hl=en
You could use Fiddle https://www.telerik.com/fiddler (free) as proxy adding caching for selected URLs or patterns. I did that a
In my XPage I have a xe:djxDataGrid (dojox.grid.datagrid) which uses xe:restService which seems to use dojox.data.JsonRestStore.
Everything works fine without proxy but my client accesses the application via a proxy because of corporate policy. After a user updates data in the DataGrid it shows old values when accessed behind the proxy.
When the REST Control/JsonRestStore sends an ajax GET request to get data, there is no Cache-Control parameter in request headers. And Domino does not place Expires parameter in the reponse headers. I believe that's why the old version of the GET request gets cached by the proxy.
We have tried to disable cache in browsers but that does not help which indicates the proxy is caching the requests.
I believe this could be solved either by:
Setting Cache-Control parameter in request headers OR
Setting Expires parameter in response headers
But I haven't found a way to set either of these. For the XPage Domino sets Expires:-1 response header but not for the ajax GET request which is:
/mypage.xsp/?$$viewid=!ddrg6o7q1z!&$$axtarget=view:_id1:_id2:callback1:restService1
This returns the JSON data to JsonRestStore and gets cached by the proxy.
One options is to try to get an exception to the proxy so requests to this site would bypass the proxy cache. But exceptions are generally not easy to get thru.
Any ideas? Thanks.
Update1
My colleque suggested that I could intercept the xhr GET requests made by dojox.data.JsonRestStore and add a time parameter to the URL to prevent cache. Here is my question about that:
Prevent cache in every Dojo xhr request on page
Update2
#SvenHasselbach has a great solution for preventing cache for all xhrs:
http://openntf.org/XSnippets.nsf/snippet.xsp?id=cache-prevention-for-dojo-xhr-requests
It seems to work perfectly, &dojo.preventCache= parameter is added to the URLs and the requests seem to return correct JSON also with this parameter. But the DataGrid stops working when I use that code. Every xhr causes this error:
Tried with Firefox and Chrome. The first page of data still loads because xhr interception is not yet in place but the subsequent pages show only "..." in each cell.
The solution is Sven Hasselbach's code in the comment section of Julian Buss's blog which needs to be slightly modified.
I changed xhrPost to xhrGet and did not place the code to dojo.addOnLoad. When placed there it was not effective in the first XHR by the DataGrid/Store.
I also removed the headers modification because it overrides existing headers. When the REST control requests data from server with xhrGet the URL is always the same and rows requested are in HTTP header like this:
Range: items=0-9
This (and other) headers disappear when the original code is used. To just add headers we would have take the existing headers from args and append to them. I didn't see a need for that because it should be enough to add the parameter in the URL. Here is the extremely simple code I'm using:
if( !(dojo._xhrGet )) {
dojo._xhrGet = dojo.xhrGet;
}
dojo.xhrGet = function (args) {
args['preventCache'] = true;
return dojo._xhrGet(args);
}
Now I'm getting all rows and all XHR Get URLs have &dojo.preventCache= parameter which is exactly what I wanted. Next we'll test in customer environment to see if this solves their problem.
Update
As Julian points out in his blog I could also use a Web Site Rule to set Expires or cache-control http response headers.
Update
The customer reports it's working now for them!
I am using jqgrid in my ASP.NET MVC application. Currently I have mTYpe: 'POST' like this:
jQuery("#myGrid").jqGrid({
mtype: 'POST',
toppager: true,
footerrow: haveFooter,
userDataOnFooter: haveFooter,
But I was reading this article, and I see this paragraph:
Browsers can cache images, JavaScript, CSS files on a user's hard
drive, and it can also cache XML HTTP calls if the call is a HTTP GET.
The cache is based on the URL. If it's the same URL, and it's cached
on the computer, then the response is loaded from the cache, not from
the server when it is requested again. Basically, the browser can
cache any HTTP GET call and return cached data based on the URL. If
you make an XML HTTP call as HTTP GET and the server returns some
special header which informs the browser to cache the response, on
future calls, the response will be immediately returned from the cache
and thus saves the delay of network roundtrip and download time.
Given this is the case, should I switch my jqGrid mType all to use "GET" from "POST" for the mType? (It says XML (doesn't mention JSON). If the answer is yes, then actually what would be a situation why I would ever want to use POST for jqGrid mType as it seems to do the same thing without this caching benefit?
The problem which you describe could be in Internet Explorer, but it will be not exist in jqGrid if you use default options.
If you look at the full URL which will be used you will see parameters like
nd=1339350870256
It has the same meaning as cache: true of jQuery.ajax. jqGrid add the current timestemp to the URL to make it unique.
I personally like to use HTTP GET in jqGrid, but I don't like the usage of nd parameter. The reason I described in the old answer. It would be better to use prmNames: {nd:null} option of jqGrid which remove the usage of nd parameter in the URL. Instead of that one can control the caching on the server side. For example the setting of
Cache-Control: private, max-age=0
is my standard setting. To set the HTTP header you need just include the following line in the code of ASP.NET MVC action
HttpContext.Current.Response.Cache.SetMaxAge (new TimeSpan (0));
You can find more details in the answer.
It's important to understand, that the header Cache-Control: private, max-age=0 don't prevent the caching of data, but the data will be never used without re-validation on the server. Using other HTTP header option ETag you can make the revalidate really working. The main idea, that the value of ETag will be always changed on changing the data on the server. In the case if the previous data are already in the web browser cache the web browser automatically send If-None-Match part in the HTTP request with the value of ETag from the cached data. So if the server see that the data are not changed it can answer with HTTP response having 304 Not Modified status and empty body of the HTTP response. It allows the web browser to use local previously cached data.
In the answer and in this one you will find the code example how to use ETag approach.
If the data that the server sends changes, then you should use POST to avoid getting cached data everytime you request it.
You should not use GET for all the purposes. GET requests are supposed to use for getting data from the server not for saving or deleting operation. GET requests has some limitation since the data you are sending to the server or appended as query-strings you can't send very large data using GET requests. Also you should not use GET request to send sensitive information to the server. You should the POST request in all the other cases like adding, editing and deleting.
As far as I'm aware jqgrid appends a unique key in every GET request so you don't get any benefit from browser caching.
One way around the caching behavior is to make the GET unique each time the request is made. jQuery.ajax() does this with "cache: false" by appending a timestamp to the end of the request. You can replicate this behavior with something similar:
uri = uri + '?_=' + (new Date()).getTime(); // uri represents the URI to the endpoint
For each time $this->session->set_userdata() or $this->session->set_flashdata() is used in my controller, another identical "Set-Cookie: ci_session=..." is added to the http header the server sends.
Multiple Set-Cookie fields, with the same cookie name, in the http header is not okay according to rfc6265.
So is there a way to use codeigniter sessions without it creating multiple identical "set-cookie:"s?
(I've used curl to verify the http header)
check https://github.com/EllisLab/CodeIgniter/pull/1780
By default when using the cookie session handler (encrypted or unencrypted), CI sends the entire "Set-Cookie" header each time a new value is written to the session. This results in multiple headers being sent to the client.
This is a problem because if too many values are written to the session, the HTTP headers can grow quite large, and some web servers will reject the response. (see http://wiki.nginx.org/HttpProxyModule#proxy_buffer_size)
The solution is to only run 'sess_save()' one time right after all other headers are sent before outputting the page contents.
I believe you can pass an array to $this->session->set_userdata(); I haven't tested this code so it is merely a suggestion to try something along these lines:
$data = array(
'whatever' => 'somevalue',
'youget' => 'theidea'
);
$this->session->set_userdata($data);
NB: When I say I haven't tested the code.. I have used this code and I know it works, I mean I havent tested if it will reduce the amount of headers sent.
In my case, the error is in the browser (Chrome). It stored 2 cookie and send both to server, this make server create new session all the time.
I fixed it by clear the cookies in browser.
Hope it help someone. :)
I want to turn off the cache used when a URL call to a server is made from VBScript running within an application on a Windows machine. What function/method/object do I use to do this?
When the call is made for the first time, my Linux based Apache server returns a response back from the CGI Perl script that it is running. However, subsequent runs of the script seem to be using the same response as for the first time, so the data is being cached somewhere. My server logs confirm that the server is not being called in those subsequent times, only in the first time.
This is what I am doing. I am using the following code from within a commercial application (don't wish to mention this application, probably not relevant to my problem):
With CreateObject("MSXML2.XMLHTTP")
.open "GET", "http://myserver/cgi-bin/nsr/nsr.cgi?aparam=1", False
.send
nsrresponse =.responseText
End With
Is there a function/method on the above object to turn off caching, or should I be calling a method/function to turn off the caching on a response object before making the URL?
I looked here for a solution: http://msdn.microsoft.com/en-us/library/ms535874(VS.85).aspx - not quite helpful enough. And here: http://www.w3.org/TR/XMLHttpRequest/ - very unfriendly and hard to read.
I am also trying to force not using the cache using http header settings and html document header meta data:
Snippet of server-side Perl CGI script that returns the response back to the calling client, set expiry to 0.
print $httpGetCGIRequest->header(
-type => 'text/html',
-expires => '+0s',
);
Http header settings in response sent back to client:
<html><head><meta http-equiv="CACHE-CONTROL" content="NO-CACHE"></head>
<body>
response message generated from server
</body>
</html>
The above http header and html document head settings haven't worked, hence my question.
I don't think that the XMLHTTP object itself does even implement caching.
You send a fresh request as soon as you call .send() on it. The whole point of caching is to avoid sending requests, but that does not happen here (as far as your code sample goes).
But if the object is used in a browser of some sort, then the browser may implement caching. In this case the common approach is to include a cache-breaker into the statement: a random URL parameter you change every time you make a new request (like, appending the current time to the URL).
Alternatively, you can make your server send a Cache-Control: no-cache, no-store HTTP-header and see if that helps.
The <meta http-equiv="CACHE-CONTROL" content="NO-CACHE> is probably useless and you can drop it entirely.
You could use WinHTTP, which does not cache HTTP responses. You should still add the cache control directive (Cache-control: no-cache) using the SetRequestHeader method, because it instructs intermediate proxies and servers not to return a previously cached response.
If you have control over the application targeted by the XMLHTTP Request (which is true in your case), you could let it send no-cache headers in the Response. This solved the issue in my case.
Response.AppendHeader("pragma", "no-cache");
Response.AppendHeader("Cache-Control", "no-cache, no-store");
As alternative, you could also append a querystring containing a random number to each requested url.