Js request download file

This reduces the amount of fs. Even on a OK we can still possibly reject due to an EEXIST file already exists imagine another process created the file whilst we were doing network calls. Recursively call download if you get a Moved Permanently or Found Moved Temporarily redirect following the link location provided in the header. The issue with some of the other answers recursively calling download was that they called resolve download instead of download This way the nested chain of promises resolve in the correct order.

It might seem cool to clean up the temp file asynchronously, but I chose to reject only after that completed too so I know that everything start to finish is done when this promise resolves or rejects. Josh Peak Josh Peak 4, 4 4 gold badges 33 33 silver badges 48 48 bronze badges.

You shouldn't waste resources doing the download if the destination file already exists. Do the check first if possible. Phil Really good point. I have updated the example with an earlier guard check before falling into the recursive networking calls but left the success file handling code the same. This short circuit guard statement should save some time in this case now.

Vince Yuan's code is great but it seems to be something wrong. But we don't check the result if callback callback err. Feel Physics Feel Physics 2, 4 4 gold badges 23 23 silver badges 36 36 bronze badges. I prefer request because you can use both http and https with it. Looks like Request has been deprecated github.

No new changes are expected to land. In fact, none have landed for some time. Wai Ha Lee 7, 61 61 gold badges 56 56 silver badges 85 85 bronze badges. Idan Dagan Idan Dagan 7, 3 3 gold badges 28 28 silver badges 38 38 bronze badges. Roman Podlinov Roman Podlinov Very clean, thank you. What do the flags 'wx' do when you're creating the writeStream? It is returning garbage character if file name is other than ascii like if filename is in japanese.

Do you think ajax-request is not a third party library? Download using promise, which resolve a readable stream. The questions was specific to not include third party modes : — David Gatti. If you are using express use res. A 13k 4 4 gold badges 90 90 silver badges bronze badges.

Using the http2 Module I saw answers using the http , https , and request modules. I'd like to add one using yet another native NodeJS module that supports either the http or https protocol: Solution I've referenced the official NodeJS API, as well as some of the other answers on this question for something I'm doing.

Rik Rik 3 3 silver badges 8 8 bronze badges. Is this backward compatible? Works everywhere or only for http2?

Neil I'm assuming you are asking if http2 is backward compatible with http1. Because http2 improves framing; adding binary compression, the ability to push from server to client, and simultaneous connections - it is absolutely required that both server and client know the implementation this allows abstraction of implementation from the application too. Good news is that all major browsers have supported http2 since about - and Node as a client does too.

Node, Nginx, and Apache offer it server side - so most use cases are covered. Its a vast improvement. Thanks for the reply Rik — Neil. Without library it could be buggy just to point out. Community Bot 1 1 1 silver badge. Why do you need a custom request header?

You'll have to proxy this server-side. Why don't you just use the download attribute if you have a link to a file? Show 6 more comments.

Active Oldest Votes. The credit for the first goes to guest, and credit for the second goes to dandavis. URL window. Also worth mentioning is the point you make in your excellent blog post , about implementing this server side by creating a temporary download path that does not require a header after the server receives a regular request with the proper headers included.

Look like that 's now, I must have broken some aliases when publishing recently. Here's the updated link: blog. Looks like you moved it again, here's the link: blog. Thanks for the detailed answer! Show 1 more comment.

I'm marking your solution as accepted, because it helped so much. My actual solution can be found here — bguiz. Add a comment. Blob objects contain information about the type and size of data they store, making them very useful for storing dynamic contents in the browser.

This method is helpful to create an object URL that represents a blob or a file. The browser will release all object URLs when the document is closed or reloaded. However, it is a good practice to release object URLs whenever they are no longer required to improve performance and minimize memory usage.

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