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import httpx, random
_BASE_V2 = "https://clinicaltrials.gov/api/v2/studies"
_BASE_V1 = "https://clinicaltrials.gov/api/query/study_fields"
_HEADERS = {
# 3 random desktop UAs – simple rotation avoids naïve geo blocks
0: "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 "
"(KHTML, like Gecko) Chrome/125 Safari/537.36",
1: "Mozilla/5.0 (Macintosh; Intel Mac OS X 12_6) AppleWebKit/605.1.15 "
"(KHTML, like Gecko) Version/16 Safari/605.1.15",
2: "Mozilla/5.0 (X11; Linux x86_64) Gecko/20100101 Firefox/126.0",
}
async def _try_v2(term: str, n: int):
p = {
"query": term,
"pageSize": n,
"fields": ",".join([
"nctId", "briefTitle", "phase", "status",
"startDate", "conditions", "interventions",
]),
}
async with httpx.AsyncClient(
headers={"User-Agent": _HEADERS[random.randint(0,2)]}, timeout=12
) as c:
r = await c.get(_BASE_V2, params=p)
if r.status_code == 403:
raise RuntimeError("v2 blocked")
r.raise_for_status()
return r.json().get("studies", [])
async def _try_v1(term: str, n: int):
p = dict(
expr=term,
fields="NCTId,BriefTitle,Phase,OverallStatus,StartDate,Condition,InterventionName",
max_rnk=n, min_rnk=1, fmt="json",
)
async with httpx.AsyncClient(
headers={"User-Agent": _HEADERS[random.randint(0,2)]}, timeout=12
) as c:
r = await c.get(_BASE_V1, params=p)
r.raise_for_status()
return r.json()["StudyFieldsResponse"]["StudyFields"]
# public
async def search_trials(term: str, max_studies: int = 20):
try:
return await _try_v2(term, max_studies)
except Exception:
try:
return await _try_v1(term, max_studies)
except Exception:
return [] # always return list
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