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Cache Tags using Workers

Send Additional Cache Tags using Workers
export default {
async fetch(request) {
const requestUrl = new URL(request.url);
const params = requestUrl.searchParams;
const tags =
params && params.has("tags") ? params.get("tags").split(",") : [];
const url =
params && params.has("uri") ? JSON.parse(params.get("uri")) : "";
if (!url) {
const errorObject = {
error: "URL cannot be empty",
};
return new Response(JSON.stringify(errorObject), { status: 400 });
}
const init = {
cf: {
cacheTags: tags,
},
};
return fetch(url, init)
.then((result) => {
const cacheStatus = result.headers.get("cf-cache-status");
const lastModified = result.headers.get("last-modified");
const response = {
cache: cacheStatus,
lastModified: lastModified,
};
return new Response(JSON.stringify(response), {
status: result.status,
});
})
.catch((err) => {
const errorObject = {
error: err.message,
};
return new Response(JSON.stringify(errorObject), { status: 500 });
});
},
};
export default {
async fetch(request): Promise<Response> {
const requestUrl = new URL(request.url);
const params = requestUrl.searchParams;
const tags =
params && params.has("tags") ? params.get("tags").split(",") : [];
const url =
params && params.has("uri") ? JSON.parse(params.get("uri")) : "";
if (!url) {
const errorObject = {
error: "URL cannot be empty",
};
return new Response(JSON.stringify(errorObject), { status: 400 });
}
const init = {
cf: {
cacheTags: tags,
},
};
return fetch(url, init)
.then((result) => {
const cacheStatus = result.headers.get("cf-cache-status");
const lastModified = result.headers.get("last-modified");
const response = {
cache: cacheStatus,
lastModified: lastModified,
};
return new Response(JSON.stringify(response), {
status: result.status,
});
})
.catch((err) => {
const errorObject = {
error: err.message,
};
return new Response(JSON.stringify(errorObject), { status: 500 });
});
},
} satisfies ExportedHandler;
from pyodide.ffi import to_js as _to_js
from js import Response, URL, Object, fetch
def to_js(x):
return _to_js(x, dict_converter=Object.fromEntries)
async def on_fetch(request):
request_url = URL.new(request.url)
params = request_url.searchParams
tags = params["tags"].split(",") if "tags" in params else []
url = params["uri"] or None
if url is None:
error = {"error": "URL cannot be empty"}
return Response.json(to_js(error), status=400)
options = {"cf": {"cacheTags": tags}}
result = await fetch(url, to_js(options))
cache_status = result.headers["cf-cache-status"]
last_modified = result.headers["last-modified"]
response = {"cache": cache_status, "lastModified": last_modified}
return Response.json(to_js(response), status=result.status)