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ProtocolVersion

property ProtocolVersion: string read;

Example​

procedure ScriptEvent(var Value: variant);
begin
  if Request <> nil then
    Value := Request.ProtocolVersion
  else
    Value := '';
end;

Usage​

ProtocolVersion returns the HTTP-version token Velox extracted from the request line, such as HTTP/1.1, as unvalidated text.

Additional Technical Info​

ProtocolVersion returns TIdHTTPRequestInfo.Version. Indy takes the text after the final space in the request line and separately attempts to parse major/minor numbers for its own server behavior. Velox exposes only the stored text, normally HTTP/1.0 or HTTP/1.1 for this bridge.

Reading the property does not negotiate, upgrade or downgrade the connection. The surrounding server/adapter has already parsed and accepted enough of the request to invoke the action. HTTP/2 or HTTP/3 can also be translated by a front proxy into an HTTP/1.x hop, so this value need not be the originating client's protocol version.

Do not select business semantics, authentication or response security solely from this string. If diagnostics need it, length-bound and treat it as transport metadata. Compare exact supported values only; malformed or extension text can be present if it reached this layer.

The value belongs to the live request and is read-only. Test Request for nil.

External references

Created 2026-07-15