{
  "id": "file.url_content_type_invalid",
  "category": "file_input",
  "summary": "The retrieved web content is unsuitable for the requested operation.",
  "match_any": [
    {
      "error_code": 400,
      "description_exact": "Bad Request: wrong type of the web page content"
    }
  ],
  "scope": {
    "method_examples": [
      "sendPhoto",
      "sendDocument"
    ],
    "exhaustive": false
  },
  "possible_causes": [
    "The retrieved page did not provide usable media for the operation."
  ],
  "diagnostic_limits": "The mapping does not identify a required MIME type or prove which part of the retrieved content is unsuitable.",
  "evidence": [
    {
      "source": "server-10.3",
      "path": "telegram-bot-api/Client.cpp",
      "lines": [
        118,
        119
      ],
      "note": "WEBPAGE_MEDIA_EMPTY is rewritten to this description."
    },
    {
      "source": "server-10.3",
      "path": "telegram-bot-api/Client.cpp",
      "lines": [
        85,
        106
      ],
      "note": "The rewrite runs only after the error is normalized to code 400."
    },
    {
      "source": "server-10.3",
      "path": "telegram-bot-api/Client.cpp",
      "lines": [
        165,
        205
      ],
      "note": "Adds the code-specific prefix and lowercases only the initial character of ordinary messages."
    }
  ],
  "example": {
    "method": "sendPhoto",
    "response": {
      "ok": false,
      "error_code": 400,
      "description": "Bad Request: wrong type of the web page content"
    }
  },
  "evidence_level": "source_derived",
  "guidance": {
    "action": "check_url_content",
    "repeat_request": "after_relevant_change",
    "preconditions": [
      "Check that the URL serves the intended media and that the selected method accepts that media type."
    ]
  }
}