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-rw-r--r--python/sandcrawler/ia.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/python/sandcrawler/ia.py b/python/sandcrawler/ia.py
index 058f4ca..8895500 100644
--- a/python/sandcrawler/ia.py
+++ b/python/sandcrawler/ia.py
@@ -406,7 +406,8 @@ class WaybackClient:
#print(resp.url, file=sys.stderr)
# defensively check that this is actually correct replay based on headers
- assert "X-Archive-Src" in resp.headers
+ if not "X-Archive-Src" in resp.headers:
+ raise WaybackError("replay fetch didn't return X-Archive-Src in headers")
if not datetime in resp.url:
raise WaybackError("didn't get exact reply (redirect?) datetime:{} got:{}".format(datetime, resp.url))