CORS origins of an array of one are made a scalar. #1536
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The access-control-allowed-origins CORS header only allows a single origin or "*" as its response. To support multiple origins, the cors middleware makes this header dynamic based on the origin header of the request when the middleware is configured with anything but a single string. To help avoid a few edge cases customers may encounter, we can unwrap an array of one element into a scalar to encourage the cors middleware to make the access-control-allowed-origin header static. As a very minor performance boost, this change also instantiates the cors middleware once and uses it on all requests rather than constructing it dynamically within a request.
colerogers
approved these changes
Mar 15, 2024
BenaymS
reviewed
Mar 25, 2024
| // on the origin header of the request. If there is only one element in the | ||
| // array, this is unnecessary. | ||
| if (Array.isArray(origin) && origin.length === 1) { | ||
| origin = origin[1]; |
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Is this a bug... shouldn't this either be origin = origin[0] or origin = undefined?
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The access-control-allowed-origins CORS header only allows a single origin or "*" as its response. To support multiple origins, the cors middleware makes this header dynamic based on the referrer header of the request when the middleware is configured with anything but a single string.
To help avoid a few edge cases customers may encounter, we can unwrap an array of one element into a scalar to encourage the cors middleware to make the access-control-allowed-origin header static.
As a very minor performance boost, this change also instantiates the cors middleware once and uses it on all requests rather than constructing it dynamically within a request.