I use POST to access https://query.wikidata.org/sparql with a bot; It seems that the first access works fine and then the second POST would get 403. This happens all the time.
I have a unique user agent.
Here is one example of such failed request
URI=https://query.wikidata.org/sparql
server=nginx/1.14.2
date=Fri, 06 Jan 2023 16:17:33 GMT
content-type=text/html
content-length=169
x-served-by=wdqs1012
age=0
x-cache=cp3064 miss, cp3058 pass
x-cache-status=pass
server-timing=cache;desc="pass", host;desc="cp3058"
strict-transport-security=max-age=106384710; includeSubDomains; preload
report-to={ "group": "wm_nel", "max_age": 86400, "endpoints": [{ "url": "https://intake-logging.wikimedia.org/v1/events?stream=w3c.reportingapi.network_error&schema_uri=/w3c/reportingapi/network_error/1.0.0" }] }
nel={ "report_to": "wm_nel", "max_age": 86400, "failure_fraction": 0.05, "success_fraction": 0.0}
accept-ch=Sec-CH-UA-Arch,Sec-CH-UA-Bitness,Sec-CH-UA-Full-Version-List,Sec-CH-UA-Model,Sec-CH-UA-Platform-Version
permissions-policy=interest-cohort=(),ch-ua-arch=(self "intake-analytics.wikimedia.org"),ch-ua-bitness=(self "intake-analytics.wikimedia.org"),ch-ua-full-version-list=(self "intake-analytics.wikimedia.org"),ch-ua-model=(self "intake-analytics.wikimedia.org"),ch-ua-platform-version=(self "intake-analytics.wikimedia.org")
x-client-ip=147.235.214.33