[OSM-dev] Sudden CORS Error on Open Street Map API calls

[Nils Nolde]

If a browser wants to do CORS on GET, then it's usually some unneeded request header causing that. See the CORS-safelisted request headers here: https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#simple_requests

Cheers
Nils

On 02.08.23 12:32, Sarah Hoffmann via dev wrote:

> On Wed, Aug 02, 2023 at 07:35:14AM +0000, Shruti Dixit via dev wrote:
>
>> Hi all,
>> ·
>> We have implemented Open Street Map and It works great though.
>> ·
>> We are facing some challenges while accessing Open Street Map API from our endpoint.
>> ·
>> The error is as follows: CORS Error :
>> ·
>> Access to XMLHttpRequest at '
>> https://nominatim.openstreetmap.org/search
>> ?                        format=json&q=vvvvv&limit=4' from origin '
>> http://localhost:4200
>> ' has been blocked by CORS policy: Request header field authorization is not allowed by Access-Control-Allow-Headers in preflight    response.
>
> This looks good here:
>
> me at machine:~/osm$ curl -I -X OPTIONS -H "Access-Control-Request-Method: GET" -H "Origin: http://  localhost:4200"
> ["https://dulcy.openstreetmap.org/search?format=json&q=vvvvv&limit=4"](https://dulcy.openstreetmap.org/search?format=json&q=vvvvv&limit=4)
> HTTP/2 204
> server: nginx
> date: Wed, 02 Aug 2023 10:16:54 GMT
> content-type: text/plain charset=UTF-8
> access-control-allow-origin: *
> access-control-allow-methods: GET,OPTIONS
>
> You need to be more specific about what you are doing and what CORS
> headers exactly your software is expecting. The only recent change is
> that we don't send access-control-allow-methods anymore with GET
> requests but that should be according to spec.
>
> We also send a 204 instead of 200 but that really shouldn't trip your
> code.
>
> Sarah
>
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>
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Nils Nolde
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