Fetching Images via HTTP

[Matthew Boyle]

Hi folks, I'm new to Node-RED and I've come across a problem that I thought would be simple but is giving me some trouble. Basically, I want to fetch an image when visiting a specific page hosted within Node-RED. To do this I create an HTTP Input object and give it the URL "/input", then pass that msg off to an HTTP Request function that points to <whatever image's> URL. Then, I pass that result straight to an HTTP Response object. I thought that this would allow me to view <whatever image> from within the page (i.e. "localhost:1880/input"), but I seem to be getting back bad data. Is this issue a duplicate of https://github.com/node-red/node-red/issues/415, or am I simply doing something wrong?

Here's the flow JSON:

[{"type":"tab","id":"e1f477ee.1e0b88","label":"Sheet 1"},{"id":"67ad1ca7.9852e4","type":"http in","name":"URLInput","url":"/input","method":"get","x":177,"y":156,"z":"e1f477ee.1e0b88","wires":[["e49c792b.1b6388"]]},{"id":"828df426.7d7208","type":"http response","name":"URLOutput","x":951,"y":156,"z":"e1f477ee.1e0b88","wires":[]},{"id":"1bcf8ccf.e43073","type":"debug","name":"name2","active":true,"console":"false","complete":"false","x":949,"y":235,"z":"e1f477ee.1e0b88","wires":[]},{"id":"e49c792b.1b6388","type":"http request","name":"GetImage","method":"GET","url":"https://www.ibm.com/developerworks/community/blogs/B-Fool/resource/BLOGS_UPLOADED_IMAGES/Capture1b.JPG","x":564,"y":155,"z":"e1f477ee.1e0b88","wires":[["828df426.7d7208","1bcf8ccf.e43073"]]}]

[Dave C-J]

Yes -  it's the same problem... - right now anything coming into http gets made into a utf-8 string - which corrupts binary images - same as 415. 

If we force it to binary then a lot of text based pages break...

We're one the way to fixing it - almost at top of the pile...

[Luis Montes]

I'd recommend swapping out the npm request module you're using in the http node for cujo's rest.  You're already using when.js so its not much more overhead, and it's promise based :)

Rest.js uses interceptors which are a simple api for modifying requests and repsonses.

A particularly cool interceptor is this one:  https://github.com/cujojs/rest/blob/master/docs/interceptors.md#module-rest/interceptor/mime

It recognizes json types and parses, as well as properly handling binary vs. text.

Luis

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