This particular inquiry raises the question of whether Ajax requests follow the order in which they are sent. While it appears that Ajax requests may not always return in the same order they were dispatched, the use of the TCP protocol suggests that packets are meant to be received in the order they were sent:
Ordered data transfer — the recipient organizes data based on sequence numbers
Do asynchronous Ajax requests come back in the exact sequence they were initiated?
Incorrect.
The issue is unrelated to TCP. It stems from the requirement for requests to be processed by an HTTP server, leading to varying completion times for parallel requests.
Is there a guarantee that asynchronous Ajax requests will always return in the order they were sent?
Not necessarily. What if the server takes much longer to respond to the first request than the others? For example:
It seems you may be conflating two different scenarios here. In the realm of ajax, launching two requests simultaneously does not ensure that one will be resolved before the other. This issue is unrelated to TCP, as it operates at a separate layer of the OSI model. The reordering and rearranging of TCP packets happen independently of the http protocol that ajax operates within.
Looking at the concept of "asynchronous" may provide insight into your query. Yet, there are instances where asynchronous requests can transform into synchronous processes. Delve into this resource for further details.
Upon sending a request, the server initiates processing of that particular request. Subsequently, if another request is made, the server will commence processing it as well. As each request completes (with or without yield), your callback function will be triggered (if defined).
When it comes to TCP requests, each packet in a single request is ensured to be received in a specific order. However, this order only holds true for each individual request. If you're sending multiple requests to different hosts, there's no guarantee on the sequence in which you'll receive responses from those hosts. Therefore, when you send asynchronous requests, you're essentially sending out multiple requests simultaneously, making it impossible to predict the order in which responses will be received, as each request operates independently from the others.
When data is transferred in an ordered manner, the destination host rearranges it based on the sequence number provided.
While you are correct in your understanding, it's important to consider the context. AJAX requests operate over HTTP, which in turn operates over TCP.
Each AJAX request initiates a new HTTP request, which in turn establishes a separate TCP connection. This means that the data packets are not rearranged or ordered as you might expect.
Due to the fact that each AJAX HTTP request can take varying lengths of time to process, and they are processed simultaneously, there is no definite order in which they will complete.
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