Support HTTP headers with CORS-method

[MagMar94]

Adds support for sending and receiving HTTP-headers when using the CORS-method.

This change is required for the Yr weather-provider introduced in #2948.

To make it easier to add unit tests I moved the server-functions into a separate file.

[MagMar94]

The tests fail because GitHub uses a different node-version. GitHub uses 16.17.1, whilst I used 19.0.0 locally. Will try to implement the tests to run on both.

[khassel]

The tests fail because GitHub uses a different node-version. GitHub uses 16.17.1, whilst I used 19.0.0 locally. Will try to implement the tests to run on both.

we are running the tests here on 3 node version, 14+16+18. Our fetch function uses the internal fetch of Node if Node version >=18 and node-fetch for older versions. May related to your problem with 14+16.

[codecov-commenter]

Codecov Report

Merging #2957 (f0319c2) into develop (7bd9443) will decrease coverage by 1.56%.
The diff coverage is 53.46%.

@@             Coverage Diff             @@
##           develop    #2957      +/-   ##
===========================================
- Coverage    65.28%   63.72%   -1.57%     
===========================================
  Files           14       15       +1     
  Lines          726      758      +32     
===========================================
+ Hits           474      483       +9     
- Misses         252      275      +23     

Impacted Files	Coverage Δ
js/server_functions.js	23.52% <23.52%> (ø)
js/app.js	69.53% <82.35%> (-0.72%)	⬇️
js/server.js	89.58% <84.84%> (+22.01%)	⬆️

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[MagMar94]

The tests fail because GitHub uses a different node-version. GitHub uses 16.17.1, whilst I used 19.0.0 locally. Will try to implement the tests to run on both.

we are running the tests here on 3 node version, 14+16+18. Our fetch function uses the internal fetch of Node if Node version >=18 and node-fetch for older versions. May related to your problem with 14+16.

Yep, working now 👍

[rejas]

some small things only

[rejas]

Unfortunately some merge conflicts now after yesterays merges. See #2961 and #2952 for node18 and fetch disuccsion.