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A 302 redirect is a server response issued by web servers, when it is asked for a particular URL which has been shifted to a new location temporarily.
This is what happens:
Browser to server: Send me page1
Server to browser: 302, page2
Browser to server: Send me page 2
When a search engine crawler gets a 302 response, realizes that page1 has now been temporarily replaced by page2. It continues to feature page1 in its search results as before.