Return 500 error by cURL

[junish]

Hi @ije. First of all, thank you so much. We are developing with esm.sh because it is very useful.

Now, we tried using esm.sh by curl. However, the response is 500 error:

❯ curl -I https://esm.sh/[email protected]

HTTP/2 500
date: Wed, 04 Jan 2023 14:31:13 GMT
content-type: text/html; charset=UTF-8
x-frame-options: SAMEORIGIN
referrer-policy: same-origin
cache-control: private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0
expires: Thu, 01 Jan 1970 00:00:01 GMT
cf-ray: 7844ad33be79df5c-NRT
server: cloudflare

But, when target query or User-Agent header is added, the response returns 200 status:

❯ curl -I 'https://esm.sh/[email protected]?target=esnext'

HTTP/2 200
date: Wed, 04 Jan 2023 14:31:46 GMT
content-type: application/javascript; charset=utf-8
content-length: 97
cf-ray: 7844adfeeb92af2b-NRT
cache-control: public, max-age=86400
vary: Origin
cf-cache-status: DYNAMIC
x-typescript-types: https://esm.sh/v102/[email protected]/types/runtime/index.d.ts
report-to: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=HMCXn3lE4GGmvCWNUK5tONV2aa7H04rom4qQYqktyhLTSjnT7mv3WYttPYmcNmq2nfVbsgfbu4h5v86lqOY0HpAM675ycyG7E%2FZqbyAkZm43dOKepMViqyM%3D"}],"group":"cf-nel","max_age":604800}
nel: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
server: cloudflare
alt-svc: h3=":443"; ma=86400, h3-29=":443"; ma=86400

❯ curl -I https://esm.sh/[email protected] \
-H 'user-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36'

HTTP/2 200
date: Wed, 04 Jan 2023 14:31:06 GMT
content-type: application/javascript; charset=utf-8
content-length: 97
cf-ray: 7844ad0a084cafe5-NRT
accept-ranges: bytes
age: 14
cache-control: public, max-age=86400
last-modified: Wed, 04 Jan 2023 14:30:52 GMT
vary: Origin, User-Agent
cf-cache-status: HIT
x-typescript-types: https://esm.sh/v102/[email protected]/types/runtime/index.d.ts
report-to: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=XxwHXDS8Z%2BcmFNS3TZsvPrhloISqm5UbkFN9N3sSEBQv%2FY5N1H9dbs5C%2BLlle7jSrEEHdrnckCWwmJcdHq6QO%2BxWVpyNdQFh0V6OxcffaXeIfT4tq%2BcR9NE%3D"}],"group":"cf-nel","max_age":604800}
nel: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
server: cloudflare
alt-svc: h3=":443"; ma=86400, h3-29=":443"; ma=86400

I’d recommend that esm.sh does not return 500 error. Could you check the happening?

[rmorshea]

I'm encountering a similar issue. I'm using some Python code to determine what exports a module has. As mentioned, setting the user agent to some acceptable value bypasses this problem.

[ije]

fixed the user-agent checking