HAProxy as a load balancer in front of two web servers
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HAProxy ends TLS and spreads visitors across two web servers. The configuration, why it says leastconn rather than roundrobin, and how to update a server without anyone noticing.
Blog
Every so often I write down what a decision cost and what it bought. In German and English, both every time.
spatie/laravel-data: validating request input with data objects
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With spatie/laravel-data one class describes what an endpoint accepts. Validation, error messages and types follow from it. With an example and the places that trip you up.
Generating a PHP client from OpenAPI – when the API does not keep to its description
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An OpenAPI description says what an API should do. The API often does something else. What that means for a generated PHP client, and how Lax, Strict and Option deal with it.
PHPArkitect: writing architecture rules as code
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Writing rules for the structure of a PHP project with PHPArkitect, freezing legacy code with a baseline, and where the tool trips you up.
Reading a scale in the browser with the Web Serial API
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Reading a GRAM Xtrem F1-30 over RS-232 and Web Serial in Chrome, with tare and zero and no extra program. Protocol, code and four snags.
Driving a label printer over WebUSB
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Printing to a Toshiba B-FV4T from Chrome with no driver or print server. WebUSB sends the raw TPCL commands to the device. Including the fix for "Access denied".
TPCL commands: text, barcode and a QR code on a label
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The commands of the Toshiba/TEC Printer Command Language in two complete examples you can download and send straight to the printer.
Adding PHPStan to an existing project
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Bringing PHPStan into a grown project without fixing 3,000 errors at once. Plus extensions that check more strictly, and a custom rule.
Reading a Fröling P4 pellet boiler over COM1
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The service protocol of the Lambdatronic 3200 on a Fröling P4: frame, checksum, escaping and the commands a Raspberry Pi uses to fetch temperatures and errors.