Description

How to reproduce

I am sending an AJAX request which has trailing slash redirect but it does not redirects because of CORS issue. I dig the code more and then i found that gin.go file has redirectRequest function github.com/gin-gonic/gin/gin.go if i add the the CORS header then the whole request works fine as you can see the screenshot under EXPECTATION section.

How to resolve the issue without modifying the GIN core file ?

func redirectRequest(c *Context) {

        // CODE INSERTED ==================
	c.Writer.Header().Set("Access-Control-Allow-Origin", c.Request.Header.Get("Origin"))

	req := c.Request
       ....
}

Expectations

Actual result

Environment

• go version: 1.14
• gin version (or commit ref): v1.6.3
• operating system: OSX