This article mainly introduces to you the solution to the problem that the content type cannot be set after the Asp.Net server sends the HTTP header. The introduction in the article is very detailed and has certain reference and learning value for everyone. Friends who need it can follow it. Let’s take a look. Found the problem: Use Npoi to export Excel, the front page is still aspx, and then the error "Failed to receive message from the server" is reported. Solution: About the error "The server cannot set the content type after sending the HTTP header": 1. The export component is using MyXLS 2. The page uses aspx 3. The main content of the page is:
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