[Node] HTTP response with a native Buffer object results gives base64

[yvele]

Repro steps

context.res.body = Buffer.from("using a buffer");

PS: I also set content-type to application/json; charset=utf-8

Expected behavior

A or B?

A. Decoded buffer

Decoded buffer should be output

using a buffer

This solution is maybe the best as you are already planing to add ExpressJS style API for HTTP responses: #781 #160

B. An explicit error message

Should throw an explicit error message like a TypeError

TypeError : Response body should be string

Actual behavior

HTTP output is: dXNpbmcgYSBidWZmZXI=

Known workarounds

context.res.body = JSON.parse(Buffer.from("using a buffer"));

Related information

I'm using my own small connect adaptor for Azure Function (working like a charm) that allows me to use express and all available middlewares. That's why I found this issue.. some middlewares are directly dealing with Buffers

edit: confirmed by @mamaso that buffer should be supported

[mamaso]

We definitely have some work to do with content negotiation in node, was just talking about this with @fabiocav yesterday. I'll play around with this scenario in express & functions and figure out a consistent behavior

[yvele]

With an Express adapter: https://github.com/yvele/azure-function-express no need to worry about content negotiation 😉

[yvele]

👍