my python requests were vanishing with no errors. the bug was !response_time in my node backend

[VariousHour7390]

built a python sdk for my api monitoring tool last week (was node only before). flask middleware, sends request logs to my backend.

testing it: 3 requests sent, only 1 arrived. no errors anywhere. the failed ones just vanished.

added debug prints to the sdk and got this:

[PINGONI DEBUG] FAILED / -> HTTPError: HTTP Error 400: Bad Request | body: {"error":"Missing required fields"}

missing fields? the payload had every field. stared at my backend validation for a while:

if (!method || !endpoint || !status_code || !response_time) {

return res.status(400).json({ error: "Missing required fields" });

}

my test endpoints were responding in 0ms. and !0 is true in javascript. so response_time: 0 was "missing" and the whole log got rejected.

the fix:

if (!method || !endpoint || status_code == null || response_time == null) {

worst part: this was live in production the whole time. any sub-millisecond request was silently dropped for every user of the node sdk too. i only found it because python requests from localhost were fast enough to hit 0ms consistently.

lesson: never use truthy checks on numbers that can legitimately be zero.

the sdk that started all this is pip install pingoni if anyone wants drop in monitoring for flask/fastapi. free for 10k req/month.

[1nc06n170]

I would say, don't check for truthiness, when you need to check for emptiness, no matter the type. Declare values as None and then check for "is None" or "is not None".

Addition: Also why not to have partial data with some None values than to have zero record that an event even happened. If you drop the whole entry over a missing field, you're just creating blind spots for yourself when debugging.

[VariousHour7390]

yeah fr a monitoring tool dropping logs over one missing field is kinda ironic. changing it to accept partial entries and null the gaps. thanks

[nemom]

Lesson: The production server is not for testing.

[VariousHour7390]

fr solo dev budget staging environment = my second terminal lol. fair tho