CODEWITHSUNDEEP
iphoneobjective-cafnetworking
eliocs
eliocs

Reputation: 18827

How to know when the server has received the request?

I'm using AFHTTPClient to connect to my backend server to upload an image using multipartFormRequestWithMethod. I'm testing the request in an iPhone app with the network conditioner using the Very Bad Network setting, this means that the request takes much longer than usual.

To avoid showing the activity indicator for ever I cancel the request after 30 seconds. In the very bad network scenario this means that:

  1. the request is cancelled before the upload has finished
  2. the request is cancelled after the upload has finished but before the request has finished.

In the second case the server has received the information and therefore stores it in the database but the client receives an error (the operation being cancelled) and therefore the user can try to upload the image again later which will result in having the same image twice.

If, I knew when the request has reached the server I could then avoid posting two times the same image.

How can I check if the server has received a request?

Upvotes: 0

Views: 1713

Answers (1)

Jeffery Thomas
Jeffery Thomas

Reputation: 42588

There really is only one way to know if the server has completed a previous request, ask the server if it has the content.

Before making the second PUT/POST, make a HEAD request for the URL you expect the image to be at to see if it exists.

Upvotes: 2

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