fastify set reply headers for all routes

Question

For every route I have to type the same headers as shown below. Is there a way to set these headers globally so that they are used by default for every route and can be overridden on a per-route basis?

fastify.post("/api/users", async (request, reply) => {
    try {
        reply
            .code(200)
             header("Access-Control-Allow-Origin", "http://localhost:3000")
            .header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept")
            .header("Content-Type", "application/json; charset=utf-8")
            .send();
    } catch (error) {
        reply
            .code(400)
            .header("Access-Control-Allow-Origin", "http://localhost:3000")
            .header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept")
            .header("Content-Type", "application/json; charset=utf-8")
            .send();
    }
});

score 6 · Answer 1 · edited Jul 12 '21 at 02:15

6

You can set some headers before use send()


fastify.addHook('preHandler', (req, repy, done) => {
  reply.header("key", "value")
  done()
})

fastify.post("api/users", async (req, reply) => {
  try {
    reply.code(200).send()
  } catch (err) {
    reply.code(400).send()
  }
})

But I saw you want to use CORS, why not use fastify-cors ?

edited Jul 12 '21 at 02:15

Karin C

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answered Jul 12 '21 at 01:37

mandaputtra

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2

onSend seems to be more appropriate – Uzlopak Nov 22 '21 at 14:31
The reason not to use `fastify-cors` is that it's an entire package to learn and add to project, all to do something that should be easy and would be more valuable to learn in another way. I have an answer elsewhere that shows how to work with headers for cors: https://stackoverflow.com/a/74131067/4808079 – Seph Reed Oct 19 '22 at 20:09

fastify set reply headers for all routes

1 Answers1