@ffurano commented on this pull request.

> @@ -1798,7 +1798,16 @@ XrdHttpReq::PostProcessChecksum(std::string &digest_header) {
     if (convert_to_base64) {free(digest_value);}
     return 0;
   } else {
-    prot->SendSimpleResp(500, NULL, NULL, "Underlying filesystem failed to calculate checksum.", 0, false);
+    // This is a result of the "Ugly" hack put in place to prevent a failing stat() on a
+    // non-manager server to fail a transfer.
+    // In the case a user issues a GET with a 'Want-Digest' header on a non-existing file, the non-failing
+    // stat() will result in a failed checksum query giving a 500 error back to the user.
+    // Here we just return a 404 instead. httpStatusCode and httpStatusText contain the right reason why the request failed.
+    if(xrderrcode != kXR_NotFound) {

uhmmmmm wait please, IMO there may be another corner case, let's talk

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