Join Stack Overflow to learn, share knowledge, and build your career. Connect and share knowledge within a single location that is structured and easy to search. I've always thought of upstream and downstream along the lines of an actual stream, where the upstream downstream still water problems work of information is like water.
I've been looking at API gateways recently and noticed that some of them used the inverse of this definition. I shrugged it off as an oddity at the time.
I then discovered that nginx, which some API gateways are based on, also uses the terminology in the opposite way to what I expected. Conceptually it seems like nginx would be pushing the requests "uphill" if going to an "upstream server", which is totally counter-intuitive Gravity is reversed in the land of reverse proxies and API gateways, apparently! Have I got my understanding of the stream analogy fundamentally wrong or upstream downstream still water problems work these software components getting the concepts backwards?
The server, while acting as a gateway or proxy, received an invalid response from the upstream server it accessed in attempting to fulfill the request. Formal definition was added later, in RFC :. Upstream and downstream describe the flow of a message: all messages flow from upstream to downstream. At the same time, in HTTP most of the data flow is not for requests, but for responses. So, if you'll consider flow of responses, then the "upstream server" term sounds pretty reasonable and logical.
The same logic can be also seen in terms "downloading" and "uploading" in natural language. Most of the Lorem lpsum 317 boatplans/dinghy/dinghy-manufacturers-usa-04 continue reading flow is from servers to clients, and that's why "downloading" means loading something from a server to a client, and "uploading" - from a client to a server.
Stack Overflow for Teams � Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn. Upstream downstream still water problems work 5 years, 7 months ago. Active 1 month ago. Viewed 19k times. Improve this question. ChrisC ChrisC 1, 1 1 gold badge 13 13 silver badges 22 22 bronze badges. Great question, this has bothered me for ages. Add a comment. Active Oldest Votes.
According to this definition: if you are looking at a request, then the client is upstream, and the upstream downstream still water problems work is downstream; in contrast, if you are looking at a Lorem lpsum 317 boatplans/boat-trailer/cost-of-a-boat-trailer-3d-model-free please click for source, then the client is downstream, upstream downstream still water problems work the server is upstream. Improve upstream downstream still water problems work answer.
Maxim Dounin Maxim Dounin 5, 1 1 gold badge 20 20 silver badges 26 26 bronze badges. Thanks, that Lorem lpsum 317 boatplans/build-boat/build-your-own-boat-console-lines this web page make sense. As someone with an integration background I must admit I tended to think of direction as being who initiated the communication rather than the volume of data being transferred.
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