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Using HTTP Headers in MetaTrader Web Requests

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Summary

This article introduces HTTP headers for developers building a request library in MetaTrader 5. It explains how headers carry metadata alongside a request or response, including authorization details, content types, accepted formats, and client identity. The examples describe common header values and show how headers are organized as key and value pairs. The practical demonstration sends a POST request to a request-inspection service, first without explicit headers and then with selected values set through the library.

The returned response illustrates headers added automatically by the terminal, such as content length, content type, accepted encodings, language preferences, and a user agent. The article then shows how explicit settings alter those values. This is an introductory programming explanation rather than trading research: it does not evaluate a trading strategy, and some default behavior is reported as the author's observation from a particular terminal setup. Authentication examples are illustrative, so actual API requirements depend on the receiving service.

Key ideas

  • HTTP headers provide metadata that helps clients and servers interpret requests and responses.
  • Common headers identify content type, authorization method, accepted formats, and client software.
  • A request inspection service can reveal which headers the MetaTrader terminal adds automatically.
  • Explicit headers can set values such as content type and user agent for an API request.
  • Header requirements vary by server, and the observed defaults may depend on the terminal environment.

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