Ryan Ramage created COUCHDB-1697:
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Summary: if-none-match header causes 500 internal server error on
CORS requests
Key: COUCHDB-1697
URL: https://issues.apache.org/jira/browse/COUCHDB-1697
Project: CouchDB
Issue Type: Bug
Components: HTTP Interface
Reporter: Ryan Ramage
Browsers can send a if-none-match header to couchdb, but this can will break
when CORS is enabled. The reason seems to be the header comes in as a binary,
eg from the debug log the header is:
{'If-None-Match',"\"V9J3604P4V9VTR5H77SBHJW\""},
When maybe_apply_cors_headers is called, the assumption is that the headers are
strings. This can be seen here:
https://github.com/apache/couchdb/blob/b0420f9006915149e81607615720f32f21c76725/src/couchdb/couch_httpd_cors.erl#L219
Thus a string:to_lower is undefined as can be seen in this stacktrace:
[info] [<0.148.0>] Stacktrace: [{string,to_lower,
[undefined],
[{file,"string.erl"},{line,468}]},
{couch_httpd_cors,maybe_apply_cors_headers,2,
[{file,
"/Users/jan/Work/build-couchdb-mac/build-couchdb/git-build/https%3A%2F%2Fgit-wip-us.apache.org%2Frepos%2Fasf%2Fcouchdb.git%3A06c3f351f158f107a8293c7c6c9b2415b942f0e9/src/couchdb/couch_httpd_cors.erl"},
{line,219}]},
{couch_httpd,send_response,4,
[{file,
See original gist
https://gist.github.com/ryanramage/5143964#file-gistfile1-txt-L64
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