Removing dead code for RequestedConnectionType

[mathieucarbou]

• RCT_NOT_USED unused only as a placeholder as a default param value
• RCT_DEFAULT was partly mean RCT_HTTP but was never assigned, so hardly usable from user code.
• RCT_MAX: unused also

[Copilot]

Pull request overview

This PR removes unused RequestedConnectionType enum values and related helper logic, simplifying how request connection type is represented and checked across the server request parsing and API surface.

Changes:

• Simplifies request header parsing logic to only treat RCT_HTTP as the “plain HTTP” baseline for WS/SSE classification.
• Removes unused RequestedConnectionType values and prunes requestedConnTypeToString() accordingly.
• Reworks isExpectedRequestedConnType(...) into a single-type check with deprecated overloads for multi-argument compatibility.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/WebRequest.cpp	Updates WS/SSE detection conditions and removes unused connection-type string/utility cases.
src/literals.h	Removes unused string literals for deleted enum values.
src/ESPAsyncWebServer.h	Removes unused enum members and refactors connection-type checking API.

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[mathieucarbou]

yes this is intentional. They should not be used by the user code anyway.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.

Suppressed comments (1)

src/ESPAsyncWebServer.h:399

• Removing the public enum values RCT_DEFAULT, RCT_NOT_USED, and RCT_MAX is a source-breaking change for downstream sketches/libraries that reference them. Consider keeping backward-compatible aliases (marked deprecated) for at least one release cycle so existing code still compiles while migrating to RCT_HTTP / the 1-arg isExpectedRequestedConnType overloads.

typedef enum {
  RCT_HTTP = 1,
  RCT_WS = 2,
  RCT_EVENT = 3
} RequestedConnectionType;