I’m interested in exposing a url from a canister where someone can send an http request to it and receive back an image. I was wondering how to do something like this: https://e3izy-jiaaa-aaaah-qacbq-cai.raw.ic0.app/?tokenid=onxj3-rakor-uwiaa-aaaaa-b4aaq-maqca-aabc7-a If I have a backend/storage c…

I’ve been looking into this as well, and have decided to go with the latter approach of returning all images and videos as blobs first retrieved to a local cache on the browser then calling createobjecturl to render the images. Out of curiosity, what project is that image link from? How did they do…

Is your backend canister implemented in rust or motoko? But in both cases it is not hard to return raw HTTP, by exposing the http_query method, at least if you are content with <canisterid>.raw.ic0.app URLs and the fact that this is not safe against malicoius nodes. There just isn’t much documenta…

@nomeata Do you know of any such example projects? I’m using motoko backend.

GitHub - nomeata/motoko-certified-http: A motoko canister that can server certified HTTP assets and you can ignore the certification stuff I guess.

@nomeata Interesting, so if I basically just include this part: public query func http_request(req : HttpRequest) : async HttpResponse { // check if / is requested if ((req.method, req.url) == ("GET", "/")) { // If so, return the main page with with right headers return { …

That will serve the content of main_page() at https://<canisterid>.raw.ic0.app/, as you can see at https://ce7vw-haaaa-aaaai-aanva-cai.ic0.app/ . But you want to serve images, and probably at different URLs. So you can add something like else if ((req.method, req.url) == ("GET", "/my_image.png"…

@nomeata Ah, okay, so how would one pass in a path variable and parse that? Let’s say I want something like: else if ((req.method, req.url) == ("GET", "/images/:imageId")) { return { status_code = 200; headers = [ ("content-type", "image/png") ]; body = { grab the co…

You probably want to analyze req.url with Text.stripStart to see if it starts with /images/ and get the remainder… there is no URL routing library for Motoko yet so you have to implement that yourself. But it’s just “plain programming” at this point :slight_smile:

If we were to use a custom implemented asset canister that exposes the same interface as the one provided by the SDK, can we still use dfx deploy to upload assets into it if we specify type : assets? I’m not too familiar with rust, can you maybe explain where the ic_asset here is coming from? …

[image] cryptoschindler: If we were to use a custom implemented asset canister that exposes the same interface as the one provided by the SDK, can we still use dfx deploy to upload assets into it if we specify type : assets ? I would assume so. [image] cryptoschindler: can you maybe expl…

Exposing URLs for querying images

Developers

pattad May 16, 2022, 4:08pm 21

I’ve compiled a little example here:

1 Like

Topic		Replies	Views
(Help)Motoko Syntax for http_request serving Jpeg Image Language Support	13	1211	September 26, 2022
Question on http_request() Developers	17	3267	August 28, 2021
Can we somehow achieve or build a canister with a interface bahaving like a classic web server Developers	53	14933	May 25, 2021
Simplest example of http streaming chunks in Motoko Developers	12	3609	February 15, 2022
Asset canister source code? Developers	11	2860	October 10, 2022

Exposing URLs for querying images

Related topics