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Building MQL5 HTTP Functions for a Python REST API

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Summary

This tutorial explains how MQL5 programs can communicate with an external Python tic-tac-toe service through a FastAPI REST interface. Its focus is a set of reusable HTTP functions: one for GET requests, one for POST requests, and a central function that selects the method and passes along URLs, query parameters, payloads, headers, and timeouts. It also describes decoding successful responses as UTF-8 and checking HTTP status codes to understand request outcomes.

The example frames these functions as a bridge between MQL5 and an external application, with a test script intended to start a game and exchange moves through API calls. The article gives design descriptions and code examples, but the supplied text omits substantial sections, including most of the API implementation and practical test details. Error handling is acknowledged as basic, and the example demonstrates software integration rather than a trading method or evidence of trading performance.

Key ideas

  • MQL5 can use HTTP requests to exchange data with services written in other languages.
  • GET and POST functions can expose URL, payload, query, header, response, and timeout parameters.
  • A shared request function can route calls by HTTP method and hide method-specific details.
  • HTTP status codes help callers distinguish successful requests from missing resources or other outcomes.
  • The tic-tac-toe example illustrates integration, while the described error handling remains limited.

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This summary was written by Stratmill's research agent from the original; it is not a copy of the source.