There are lots of cookies present and I need to extract those cookie and pass them as a post parameter in further request. So i have changed the setting for them in jmeter.property file as
save.cookies=true
check.cookies=false
Then after running the test, I got those cookie value in debug sampler as ${COOKIE_}
EXPECTED:
GET data:
Cookie Data:
private_content_version=e17f5f6a5ed9557378a6f85fa2202c0e;form_key=mCPI56sUAl6bqAJdqq;
Actual Result
GET data:
[no cookies]
I have passed in the value in HTTP header manager as
name=private_content_version
Value=${COOKIE_private_content_version}
name=form_key
Value=${COOKIE_Form_key}
But instead of value, same variable is passed as ${COOKIE_private_content_version}
Also there are multiple cookies and I need to fetch them too and pass them in further http request payload,but unable to do that.What I AM MISSING?Please help
DO I NEED TO ADD THEM COOKIE MANAGER UNDER EACH OF THE HTTP REQUEST?OR DEFINED IN GLOBALLY?
Also how to define them ?
You don't need to manually add cookies in the HTTP Header Manager, the Cookie Manager should normally handle them.
If for some reason you need to build Cookie header manually make sure to use strict Cookie name and in the value one or more name/value pairs of cookies separated by semicolons
You might find HTTP Cookie Manager Advanced Usage - A Guide article useful, it contains comprehensive information on HTTP Cookie Manager configuration and troubleshooting.
Update: Collected my thoughts better
I'm generating a unique identifier (UUID) for each user in the Viewer Request Lambda, and then selecting a cached page to return based upon that UUID. This works.
Ideally, this user would always have the same UUID.
I must generate that UUID in the Viewer Request if it is not present in a cookie on that Viewer Request. I also need that UUID to be set as a cookie, which of course happens in the response not the request.
Without caching, my server simply handles taking a custom header and creating a Set-Cookie in the response header.
I am not finding a way to handle this if I want to cache the page. I can ignore the request header for caching and serve the correct cached page, but then the user does not persist that UUID as no cookie is set to be utilized in their next request.
Has anyone accomplished something like this?
Things I'm trying
There are a few angles I'm working on with this, but haven't been able to get to work yet:
Some sort of setting in Cloudfront I'm unaware of that handles the header or other data pass-through from Viewer Request to Viewer Response, which could be used in a second lambda in Cloudfront.
Modify the response object headers preemptively in the Viewer Request. I don't think this is possible, as they return headers are not yet created, unless there's some built-in Cloudfront methodology I'm missing.
An existing pass-through header of some sort, I don't know if that's even a thing since I'm not intimately familiar with this aspect of request-response handling, but worth a shot.
Possibly (haven't tried yet though) I could create the entire response object in the Client Request lambda and somehow serve the cached page from there, modifying the response headers then passing it into the callback method.
Tobin's answer actually works, but is not a solid solution. If the user is not storing or serving their cookies it becomes an infinite loop, plus I'd rather not throw a redirect up in front of all of my pages if I can avoid it
Somewhat-working concept
Viewer Request Lambda, when UUID not present in cookies, generates UUID
Viewer Request Lambda sets UUID in cookies on header in request object. Callback with updated request object passed in
Presence of UUID cookie busts Cloudfront cache
Origin Request Lambda is triggered with UUID present
Origin Request Lambda calls original request URL again via http.get with UUID cookie set (40KB limit makes doing this in the Viewer Request Lambda impractical)
Second scenario for Viewer Request Lambda, seeing UUID now present, strips the UUID cookie then continues the request normally
Second Origin Request if not yet cached - Cached response if cached, as cache-busting UUID is not present - returns actual page HTML to First Origin Request
First Origin Request receives response from http.get containing HTML
First Origin Request creates custom response object containing response body from http.get and Set-Cookie header set with our original UUID
Subsequent calls, having the UUID already set, will strip the UUID from the cookie (to prevent cache busting) and skip directly to the second-scenario in the Viewer Request Lambda which will directly load the cached version of the page.
I say "somewhat" because when I try to hit my endpoint, I get a binary file downloaded.
EDIT
This is because I was not setting the content-type header. I now have only a 302 redirect problem... if I overcome this I'll post a full answer.
Original question
I have a function on the Viewer Request that picks an option and sets some things in the request before it's retrieved from the cache or server.
That works, but I want it to remember that choice for future users. The thought is to simply set a cookie I can read the next time that user comes through. As this is on the Viewer Request and not the Viewer Response I haven't figured out how to make that happen, or if it even is possible via the Lambda itself.
Viewer Request ->
Lambda picks options (needs to set cookie) ->
gets corresponding content ->
returns to Viewer with set-cookie header intact
I have seen the examples and been able to set cookies successfully in the Viewer Response via a Lambda. That doesn't help me much as the decision needs to be made on the request. Quite unsurprisingly adding this code into the Viewer Request shows nothing in the response.
I would argue that the really correct way to set a nonexistent cookie would be to return a 302 redirect to the same URI with Set-Cookie, and let the browser redo the request. This probably would not have much of an impact since the browser can reuse the same connection to "follow" the redirect.
But if you insist on not doing it that way, then you can inject the cookie into the request with your Viewer Request trigger and then emit a Set-Cookie with the same value in your Viewer Response trigger.
The request object, in a viewer response event, can be found at the same place where it's found in the original request event, event.Records[0].cf.request.
In a viewer-response trigger, this part of the structure contains the "request that CloudFront received from the viewer and that might have been modified by the Lambda function that was triggered by a viewer request event."
Use caution to ensure that you handle the cookie header correctly. The Cookie request header requires careful and accurate manipulation because the browser can use multiple formats when multiple cookies exist.
Once upon a time, cookies were required to be sent as a single request header.
Cookie: foo=bar; buzz=fizz
Parse these by splitting the values on ; followed by <space>.
But the browser may also split them with multiple headers, like this:
Cookie: foo=bar
Cookie: buzz=fizz
In the latter case, the array event.Records[0].cf.request.headers.cookie will contain multiple members. You need to examine the value attribute of each object in that array, check for multiple values within each, as well as accommodating the fact that the array will be completely undefined (not empty) if no cookies exist.
Bonus: Here's a function I wrote, that I believe correctly handles all cases including the case where there are no cookies. It will extract the cookie with the name you are looking for. Cookie names are case-sensitive.
// extract a cookie value from request headers, by cookie name
// const my_cookie_value = extract_cookie(event.Records[0].cf.request.headers,'MYCOOKIENAME');
// returns null if the cookie can't be found
// https://stackoverflow.com/a/55436033/1695906
function extract_cookie(headers, cname) {
const cookies = headers['cookie'];
if(!cookies)
{
console.log("extract_cookie(): no 'Cookie:' headers in request");
return null;
}
// iterate through each Cookie header in the request, last to first
for (var n = cookies.length; n--;)
{
// examine all values within each header value, last to first
const cval = cookies[n].value.split(/;\ /);
const vlen = cval.length;
for (var m = vlen; m--;)
{
const cookie_kv = cval[m].split('=');
if(cookie_kv[0] === cname)
{
return cookie_kv[1];
}
} // for m (each value)
} // for n (each header)
// we have no match if we reach this point
console.log('extract_cookie(): cookies were found, but the specified cookie is absent');
return null;
}
Are you able to add another directory: with the first cookie setter request, return (from the lambda) a redirect which includes the cookie-set header, that redirects to your actual content?
OK, long way round but:
Take cookie instruction from the incoming request
Set this somewhere (cache, etc)
Let the request get your object
on the Response, also call a function that reads the (cache) and sets the set-cookie header on the response if needed?
It's been more than one year since the question was published. I hope you found a solution and you can share it with us!
I am facing the same problem and I've thinking also about the infinite loop... What about this?
The viewer request event sends back a 302 response with the cookie set, e.g. uuid=whatever and a GET parameter added to the URL in the Location header, e.g. _uuid_set_=1.
In the next viewer request where the GET parameter _uuid_set_ is set (and equals 1, but this is not needed), there will be two options:
Either the cookie uuid is not set, in which case you can send back a response 500 to break the loop, or whatever fits your needs,
or the cookie is set, in which case you send another 302 back with the parameter _uuid_set_ removed, so that it is never seen by the end user and cannot be copy-pasted and shared and we all can sleep at night.
i'm sending GET requests to my local REST server and I'm trying to set the request Cookie header to something different each time.
however, it seems that postman is somehow caching something because whenever I modify my cookie header request contents to something new it sends the old cookie header request contents.
i have no idea why it doesn't pick up the new cookie header contents that I set. this is not with interceptor turned on.
I am writting a client program. When I login, the server will send some cookies to me in the 'Set-Cookie' header field.
I need to get the cookies, because the rest of the request will need them.
I try to get the cookies with xmlhttprequest.getResponseHeader("Set-Cookie"), but failed.
I don't want to use C++, so could it be possible?
No, it is not possible without using C++.
Look at source code for QDeclarativeXMLHttpRequest::fillHeadersList() method. It particularly removes set-cookie and set-cookie2 headers, following w3c specs for XMLHttpRequest object. Specifically behaviour of getAllResponseHeaders method. That is:
Return all the HTTP headers, excluding headers that are a case-insensitive match for Set-Cookie or Set-Cookie2, ...
I'm stuck in a cookie related question. I want to write a program that can automate download the attachments of this forum. So I should maintain the cookies this site send to me. When I send a GET request in my program to the login page, I got the cookie such as Set-Cookie: sso_sid=0589a967; domain=.it168.com in my program. Now if I use a cookie viewer such as cookie monster and send the same GET request, my program get the same result, but the cookie viewer shows that the site also send me two cookies which are:
testcookie http://get2know.it/myimages/2009-12-27_072438.jpg and token http://get2know.it/myimages/2009-12-27_072442.jpg
My question is: Where did the two cookie came from? Why they did not show in my program?
Thanks.
Your best bet to figure out screen-scraping problems like this one is to use Fiddler. Using Fiddler, you can compare exactly what is going over the wire in your app vs. when accessing the site from a browser. I suspect you'll see some difference between headers sent by your app vs. headers sent by the browser-- this will likley account for the difference you're seeing.
Next, you can do one of two things:
change your app to send exactly the headers that the browser does (and, if you do this, you should get exactly the response that a real browser gets).
using Fiddler's "request builder" feature, start removing headers one by one and re-issuing the request. At some point, you'll remove a header which makes the response not match the response you're looking for. That means that header is required. Continue for all other headers until you have a list of headers that are required by the site to yield the response you want.
Personally, I like option #2 since it requires a minimum amount of header-setting code, although it's harder initially to figure out which headers the site requires.
On your actual question of why you're seeing 2 cookies, only the diagnosis above will tell you for sure, but I suspect it may have to do with the mechanism that some sites use to detect clients who don't accept cookies. On the first request in a session, many sites will "probe" a client to see if the client accepts cookies. Typically they'll do this:
if the request doesn't have a cookie on it, the site will redirect the client to a special "cookie setting" URL.
The redirect response, in addition to having a Location: header which does the redirect, will also return a Set-Cookie header to set the cookie. The redirect will typically contain the original URL as a query string parameter.
The server-side handler for the "cookie setter" page will then look at the incoming cookie. If it's blank, this means that the user's browser is set to not accept cookies, and the site will typically redirect the user to a "sorry, you must use cookies to use this site" page.
If, however, there is a cookie header send to the "cookie setter" URL, then the client does in fact accept cookies, and the handler will simply redirect the client back to the original URL.
The original URL, once you move on to the next page, may add an additional cookie (e.g. for a login token).
Anyway, that's one way you could end up with two cookies. Only diagnosis with Fiddler (or a similar tool) will tell you for sure, though.