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Koa always overwrite `Content-Type` for JSON responses

See original GitHub issue

const Koa = require('koa');
const app = new Koa();
app.use(ctx => {
  ctx.set('Content-Type', 'application/vnd.myapi.v1+json');
  ctx.body = {message: 'hello'};
});
app.listen(3000);

When running this code I aways get Content-Type: application/json; charset=utf-8.

I can make it work if I write the header after setting the body. It only affects json responses. I’m not sure if that’s a bug, but I couldn’t find any information about that behavior in documentation.

Issue Analytics

State:
Created 6 years ago
Reactions:3
Comments:9 (2 by maintainers)

Top GitHub Comments

7reactions

jonathanongcommented, Jan 31, 2018

seems like a bug where it overwrites the content type when the content type is set and has +json in it.

4reactions

uzilcommented, Feb 2, 2018

Check if body has value of type object, and if the header contains +json preserve the user given header. Is this the desired implementation of fix for this bug?

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