public Set<String> getAllSecuritySchemeRequestHeaders() {
        Set<String> headers = new TreeSet<>();
        for (SecuritySchemeConverter<?> converter : getSecuritySchemeConverters()) {
            headers.addAll(getSecuritySchemeRequestHeaders(this, converter));
        }
        return headers;
    }
Gets an alphabetically sorted set of request headers used by every
security scheme associated with the API.

<p>This is useful when integrating with things like CORS.</p>

@return Returns the set of every request header used by every security scheme.
smithy-openapi/src/main/java/software/amazon/smithy/openapi/fromsmithy/Context.java