remove redirector for S3 API calls (#1601)

S3 APIs behave in non-standard style
not following HTTP spec for redirections

Refer here

https://github.com/aws/aws-sdk-go/blob/main/service/s3/s3manager/bucket_region.go#L117

```
// Disable HTTP redirects to prevent an invalid 301 from eating the response
// because Go's HTTP client will fail, and drop the response if an 301 is
// received without a location header. S3 will return a 301 without the
// location header for HeadObject API calls.
req.DisableFollowRedirects = true
```

Fixes the issue minio/minio#13918

api.go

@@ -182,67 +182,6 @@ func (r *lockedRandSource) Seed(seed int64) {
 	r.lk.Unlock()
 }
 
-// Redirect requests by re signing the request.
-func (c *Client) redirectHeaders(req *http.Request, via []*http.Request) error {
-	if len(via) >= 5 {
-		return errors.New("stopped after 5 redirects")
-	}
-	if len(via) == 0 {
-		return nil
-	}
-	lastRequest := via[len(via)-1]
-	var reAuth bool
-	for attr, val := range lastRequest.Header {
-		// if hosts do not match do not copy Authorization header
-		if attr == "Authorization" && req.Host != lastRequest.Host {
-			reAuth = true
-			continue
-		}
-		if _, ok := req.Header[attr]; !ok {
-			req.Header[attr] = val
-		}
-	}
-
-	*c.endpointURL = *req.URL
-
-	value, err := c.credsProvider.Get()
-	if err != nil {
-		return err
-	}
-	var (
-		signerType      = value.SignerType
-		accessKeyID     = value.AccessKeyID
-		secretAccessKey = value.SecretAccessKey
-		sessionToken    = value.SessionToken
-		region          = c.region
-	)
-
-	// Custom signer set then override the behavior.
-	if c.overrideSignerType != credentials.SignatureDefault {
-		signerType = c.overrideSignerType
-	}
-
-	// If signerType returned by credentials helper is anonymous,
-	// then do not sign regardless of signerType override.
-	if value.SignerType == credentials.SignatureAnonymous {
-		signerType = credentials.SignatureAnonymous
-	}
-
-	if reAuth {
-		// Check if there is no region override, if not get it from the URL if possible.
-		if region == "" {
-			region = s3utils.GetRegionFromURL(*c.endpointURL)
-		}
-		switch {
-		case signerType.IsV2():
-			return errors.New("signature V2 cannot support redirection")
-		case signerType.IsV4():
-			signer.SignV4(*req, accessKeyID, secretAccessKey, sessionToken, getDefaultLocation(*c.endpointURL, region))
-		}
-	}
-	return nil
-}
-
 func privateNew(endpoint string, opts *Options) (*Client, error) {
 	// construct endpoint.
 	endpointURL, err := getEndpointURL(endpoint, opts.Secure)
@@ -279,9 +218,11 @@ func privateNew(endpoint string, opts *Options) (*Client, error) {
 
 	// Instantiate http client and bucket location cache.
 	clnt.httpClient = &http.Client{
-		Jar:           jar,
-		Transport:     transport,
-		CheckRedirect: clnt.redirectHeaders,
+		Jar:       jar,
+		Transport: transport,
+		CheckRedirect: func(req *http.Request, via []*http.Request) error {
+			return http.ErrUseLastResponse
+		},
 	}
 
 	// Sets custom region, if region is empty bucket location cache is used automatically.