move processing of Upload-Metadata: to the right place

src/tus_request.c

@@ -232,14 +232,6 @@ tus_request(VRT_CTX, struct VPFX(tus_server) *tussrv,
 		http_Unset(ctx->http_req, hdr_method);
 	}
 
-	if (http_GetHdr(ctx->http_req, hdr_meta, &metadata) &&
-	    tus_metadata_validate(metadata, NULL) == 0) {
-		VSLb(ctx->vsl, SLT_Error, "%s: bad metadata format",
-		    tus_server_name(tussrv));
-		r->status = 400;
-		return (0);
-	}
-
 	m = parse_met(http_GetMethod(ctx->http_req));
 
 	(void) http_GetHdr(ctx->http_req, hdr_origin, &r->origin);
@@ -280,6 +272,14 @@ tus_request(VRT_CTX, struct VPFX(tus_server) *tussrv,
 		}
 	}
 
+	if (http_GetHdr(ctx->http_req, hdr_meta, &metadata) &&
+	    tus_metadata_validate(metadata, NULL) == 0) {
+		VSLb(ctx->vsl, SLT_Error, "%s: bad metadata format",
+		    tus_server_name(tussrv));
+		r->status = 400;
+		return (0);
+	}
+
 	AZ(pthread_mutex_lock(&tussrv->mtx));
 
 	if (m == POST) {