Preface on CORS # Cross-Origin Resource Sharing ( CORS) is an “issue” that often pops up during development of web applications that call backend services for data and functionality.
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After learning the basics of Progressive Web Applications (PWAs) at work, I decided to update this site to fill the requirements of a PWA.
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Scenario # Front-end container front, serving a webapp on port 9001 Back-end service container back, serving an API on port 80 Primary Objective: Reach and query back container from the front, using its service name: http://back/.
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Here, a ‘failing step’ means a step that includes a command with a non-zero exit code.
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Target architecture # Two sub-domains, single TSL wildcard certificate Single load balancer (with a singular public IP) Two environments (=namespaces) of an application with both front and back components graph LR subgraph domains[Domains] url-one[one.
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