[GitHub] [couchdb] natevw opened a new issue #2046: Returns 500 instead of 400 when document has unexpected fields

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natevw opened a new issue #2046: Returns 500 instead of 400 when document has unexpected fields
URL: https://github.com/apache/couchdb/issues/2046
 
 
   CouchDB is returning a 500 (server) error instead of a 400 (client) error when an invalid document is submitted.
   
   ## Description
   
   If I PUT a document to CouchDB with a reserved field starting with an underscore, I get a 500 error:
   
   ```
   [Tue, 04 Jun 2019 17:23:19 GMT] [info] [<0.19565.117>] 127.0.0.1 - - PUT /my-db/my-doc 500
   [Tue, 04 Jun 2019 17:23:19 GMT] [error] [<0.19565.117>] httpd 500 error response:
    {"error":"doc_validation","reason":"Bad special document member: _uiField"}
   ```
   
   See https://github.com/jo/couchdb-compile/issues/17 for another example of this coming through in the wild.
   
   The field in the document is invalid (in this case `_uiField` was never intended to be saved), but CouchDB *should* be returning a 400 instead of 500 error.

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