async function sendFileContent(url, id, mime, processText) {
		let fs = fsOperation(url);

		if (!(await fs.exists())) {
			const xfs = fsOperation(Url.join(pathName, filename));

			if (await xfs.exists()) {
				fs = xfs;
				isFallback = true;
				console.log(`fallback ${Url.join(pathName, filename)}`);
			} else {
				console.log(`${url} doesnt exists`);
				error(id);
			}

			return;
		}

		let text = await fs.readFile(appSettings.value.defaultFileEncoding);
		text = processText ? processText(text) : text;
		if (mime === MIMETYPE_HTML) {
			sendHTML(text, id);
		} else {
			sendText(text, id, mime);
		}
	}
Sends file content
@param {string} url
@param {string} id
@param {string} mime
@param {(txt: string) => string} processText
@returns