CODEWITHSUNDEEP
asp.net-mvcjquery
garethb
garethb

Reputation: 4041

Jquery Ajax post sometimes turns to get MVC

I have the following line in my page which is called whenever a change is made in the form (the change in the form is persisted and stored in session):

function persistFormDetails() {
    $.post("<%= Url.Action<AvailabilityController>(action => action.PersistForm(null)) %>", $("form#availabilityForm").serialize());
}

The above is called from 3 different events happening on the page: $("select").change, $("#NumberOfNights").change, $("#PromoCode").change.

These are the only 3 calls to 'PersistForm'. This works most of the time, but >5% of the time, 'PersistForm' is called using get instead of post. Extract from our weblogs for a failed request:

2012-08-07 06:17:34 120.151.214.16 - HTTP 10.12.0.151 80 POST /availability/persistform - 302 1151 434 0 HTTP/1.1 Mozilla/5.0+(iPhone;+CPU+iPhone+OS+5_1_1+like+Mac+OS+X)+AppleWebKit/534.46+(KHTML,+like+Gecko)+Version/5.1+Mobile/9B206+Safari/7534.48.3 __utma=212581192.532115380.1343637559.1343637559.1344320319.2;+__utmb=212581192.1.10.1344320319;+__utmc=212581192;+__utmz=212581192.1343637559.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none);+.BREAKFREEBOOKING=H7n50kf8yh2VLsbC2Czo6LALPpef1jqj4RtcC4l34Q-fA3WKG8dD5Dps9CFq2i3j-YEVMEH5qTh_b5f7IDRJ5NYeB28gBV_czMmGeSfnd26FHsw83WbwBpz2K3oAVYCg6dG_MiOKqrpn8ViaBizKMKXD4yw1;+stella_referrer=referrerGuestId=14076864270&additionalInfo=mantra_on_kent_24h_sale30aug12&referrerSite= http://m.mantra.com.au/check-availability
2012-08-07 06:17:34 120.151.214.16 - HTTP 10.12.0.152 80 GET /availability/persistform chkCookies=True 302 950 353 0 HTTP/1.1 Mozilla/5.0+(iPhone;+CPU+iPhone+OS+5_1_1+like+Mac+OS+X)+AppleWebKit/534.46+(KHTML,+like+Gecko)+Version/5.1+Mobile/9B206+Safari/7534.48.3 __utma=212581192.532115380.1343637559.1343637559.1344320319.2;+__utmb=212581192.2.10.1344320319;+__utmc=212581192;+__utmz=212581192.1343637559.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none);+.testCookie=.testCookie;+.BREAKFREEBOOKING=H7n50kf8yh2VLsbC2Czo6LALPpef1jqj4RtcC4l34Q-fA3WKG8dD5Dps9CFq2i3j-YEVMEH5qTh_b5f7IDRJ5NYeB28gBV_czMmGeSfnd26FHsw83WbwBpz2K3oAVYCg6dG_MiOKqrpn8ViaBizKMKXD4yw1;+stella_referrer=referrerGuestId=14076864270&additionalInfo=mantra_on_kent_24h_sale30aug12&referrerSite= http://m.mantra.com.au/check-availability

Note the first call to 'PersistForm' does a post (correct) but then 302's (not sure why its redirecting). Then the very next call from the same user on the same session and time calls 'PersistForm' and this time its with get. Then we get an exception "A public action method 'persistform' was not found on controller 'MG.Mobile.Controllers.AvailabilityController'".

This makes sense as my 'PersistForm' action has a HttpPost attribute.

[HttpPost]
public ActionResult PersistForm(AvailabilityForm form)
{
    var model = _availabilityMapper.MapViewToDomain(form);
    _availabilitySession.SaveAvailabilityToSession(model);

     return new EmptyResult();
}

We can't allow gets on this action as it posts a lot of data. As I said earlier, this only happens about 5% of the time (maybe less).

Any ideas on why I sometimes get a 'get' instead of a 'post' or why the call to 'persistform' 302's (redirects) sometimes?

This is for our mobile site and the problem has only shown up with iPhone (but this could just be coincidence as 75% of mobile visits to our site are with iPhone).

Upvotes: 3

Views: 377

Answers (1)

Alexander Beletsky
Alexander Beletsky

Reputation: 19821

Interesting issue. I put some my assumption here.

What I can see is that you controller is Sessionfull. That means that each request locks the Session object, so multiple requests from same client are handled one by one (request is wait till the Session lock is released).

As soon as you got to much, server might reach some threshold so, redirecting the request.

Options to try:

  1. For such heavy loaded API, it is better to go with Session-Less model.
  2. Try to utilize ASP.NET MVC Async controllers.

Upvotes: 1

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