Firebase functions route to specific http method

Question

I want to have a separate function for each HTTP method (GET, POST, PATCH....) - for the same URI path, for example:

// express app
...
getUser.get('/api/v1/user/:id', async (req, res) => {
...
updateUser.patch('/api/v1/user/:id', async (req, res) => {
...

exports.getUser = functions.https.onRequest(getUser);
exports.updateUser = functions.https.onRequest(updateUser);

But I don't know how to specify hosting rewrites configuration for such cases.

Is it possible to route different HTTP methods to different functions (in firebase.json file)?

When you say "route different HTTP methods", are you saying you want a different methods (like GET and PATCH) for the same URI path to different functions in your Firebase Hosting configuration? — Doug Stevenson
– Doug Stevenson, Commented Jul 10, 2020 at 19:54

Doug Stevenson · Accepted Answer · 2020-07-10 22:15:20Z

1

According to the documentation, Firebase Hosting doesn't you specify a method for rewriting. You can only provide a URI path.

What you should probably do here is create a single express app that contains all of the methods for the single endpoint, and export that through a single named function. Express will know what to do with the method.

answered Jul 10, 2020 at 22:15

Doug Stevenson

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4 Comments

Dennis Liger Over a year ago

yes, but in this case I will lose all monitoring capability, like performance, memory and etc... for each method... =(

Doug Stevenson Over a year ago

I don't think you have another option.

Dennis Liger Over a year ago

yeh... looks like platform doesn't support that... I'm considering using specific path like '/api/v1/user/:id'/post, '/api/v1/user/:id'/patch...

Doug Stevenson Over a year ago

Sure, but then your API is no longer very rest-like.

Len Nelson · Accepted Answer · 2024-01-29 22:16:21Z

There's no great way to handle this. If you use Express then every endpoint is under the same endpoint, as far as Google analytics goes.

One way is to do as you suggested, where you have the word 'get', 'post', etc in the URL, but then you can create one additional endpoint that doesn't have the method in the name (no 'get' or 'post' etc) and in that function check the 'request.method' and then request.redirect to the other appropriate function that has the 'get' 'post' etc in it.

So I have these public urls:

www.myWebsite.com/customer/get
www.myWebsite.com/customer/post

For these internal functions

export const cust_get = onRequest((request, response)...
export const cust_post = onRequest((request, response)...

with these URL rewrites

 {
    "source": "/customer/get/**",
    "function": "cust_get"
  },
  {
    "source": "/customer/post",
    "function": "cust_post"
  },

where of course in the cust_get I'll have to parse out the customer ID from the path (it not using Express).

But then I also add an extra function

export const cust = onRequest((request, response)=>{

 if (request.method == 'POST')
    response.redirect('/customer/post');
 else if (request.method == 'GET')
    response.redirect('/customer/get');//you'll need to also pass any params passed in
}

And then add one more rewrite for that...

  {
    "source": "/customer",
    "function": "cust"
  },

It's still ugly since the client has to make two http calls; however, if they don't like it, they can just call the customer_get or customer_post directly.

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