Sending a details request to Google Places API - (CORS error)

问题

I'm trying to augment the collection of photos I have for public artworks in this project I'm working on with photos from the Google Places API. It says here that you can send a details request to get an array of ten photos. Eventually I will unpack the response to get Google's photo reference for each photo and make requests for each photo in the array and display it.

Unfortunately, this plan breaks when I send my details request. This is the exact error I'm getting:

Fetch API cannot load https://maps.googleapis.com/maps/api/place/details/json?placeid=ChIJ5zf5lfXKRIYR8rPafbwaL68&key=MY_API_KEY. 
No 'Access-Control-Allow-Origin' header is present on the requested resource. 
Origin 'http://localhost:4040' is therefore not allowed access. 
If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

I'm running this from my localhost and I'm pretty sure that matters. All of my other API calls (Google Maps API and a couple others) are written exactly as this is, so I'm a little confused why I'm getting the error. Here is the relevant code:

The actual API call:

export function getPhotos(placeID) {
  let obj = {
    method: 'GET'
  };
  return fetch('https://maps.googleapis.com/maps/api/place/details/json?placeid=' + placeID + '&key=MY_API_KEY')
    .then((response) => {
      if (response.status >= 400){
        throw new Error("Error getting photos for placeID: " + placeID)
      }
      return response.json()
    })
}

Let me know if you need any other information, I'd be happy to provide it. Thanks!

回答1:

You need to use a server side proxy to prevent this error. It works when you access the url directly because you have no origin when you do that.

• JS AJAX request to local server -> remote server, request received, response sent, remote server -> local server -> AJAX request to JS.

Check this related SO question:

• What to do when an API doesn't allow Access-Control-Allow-Origin
• webpack dev server CORS issue

You can either modify your API server so that CORS is enabled, or follow the instructions on the webpack-dev-server page under "Combining with an existing server" to combine asset serving with webpack-dev-server and your own API server.

• How do I make a CORS request with fetch on my localhost?

Hope this helps!

回答2:

The previous answer suggests using a server-side proxy. While that is a good solution for the general case of accessing a web API that does not support CORS or JSONP, it's not the best solution for this specific problem.

Instead, use Google's JavaScript Places Library which is designed specifically for this kind of use. The links at the top of that page provide additional samples, guides, and reference material.

来源：https://stackoverflow.com/questions/38542306/sending-a-details-request-to-google-places-api-cors-error