From ccac88c1d1d6aec8f572e0a07fb57635ebdd4a80 Mon Sep 17 00:00:00 2001
From: Daniel Hecker <git@dduenker.de>
Date: Wed, 7 Apr 2021 21:55:26 +0200
Subject: [PATCH 1/2] use LAST-MODIFIED as ETAG, when ETAG is missing

---
 src/cache.rs | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/cache.rs b/src/cache.rs
index c54b773..1032db1 100644
--- a/src/cache.rs
+++ b/src/cache.rs
@@ -3,7 +3,7 @@ use glob::glob;
 use log::{debug, error, info, warn};
 use rand::distributions::{Distribution, Uniform};
 use reqwest::blocking::{Client, ClientBuilder};
-use reqwest::header::ETAG;
+use reqwest::header::{ETAG, LAST_MODIFIED};
 use std::default::Default;
 use std::env;
 use std::fs::{self, OpenOptions};
@@ -587,7 +587,18 @@ impl Cache {
                 Ok(None)
             }
         } else {
-            Ok(None)
+            if let Some(last_modified) = response.headers().get(LAST_MODIFIED) {
+                if let Ok(s) = last_modified.to_str() {
+                    debug!("LAST-MODIFIED: {}", s);
+                    Ok(Some(s.into()))
+                } else {
+                    debug!("No LAST-MODIFIED for {}", url);
+                    Ok(None)
+                }
+            } else {
+                debug!("No LAST-MODIFIED for {}", url);
+                Ok(None)
+            }
         }
     }
 

From 2762ec197c4835008c25b8ebb9ae443a17c31875 Mon Sep 17 00:00:00 2001
From: Daniel Hecker <git@dduenker.de>
Date: Wed, 7 Apr 2021 22:14:10 +0200
Subject: [PATCH 2/2] collapse else

---
 src/cache.rs | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/src/cache.rs b/src/cache.rs
index 1032db1..14d3d53 100644
--- a/src/cache.rs
+++ b/src/cache.rs
@@ -586,19 +586,17 @@ impl Cache {
                 debug!("No ETAG for {}", url);
                 Ok(None)
             }
-        } else {
-            if let Some(last_modified) = response.headers().get(LAST_MODIFIED) {
-                if let Ok(s) = last_modified.to_str() {
-                    debug!("LAST-MODIFIED: {}", s);
-                    Ok(Some(s.into()))
-                } else {
-                    debug!("No LAST-MODIFIED for {}", url);
-                    Ok(None)
-                }
+        } else if let Some(last_modified) = response.headers().get(LAST_MODIFIED) {
+            if let Ok(s) = last_modified.to_str() {
+                debug!("LAST-MODIFIED: {}", s);
+                Ok(Some(s.into()))
             } else {
                 debug!("No LAST-MODIFIED for {}", url);
                 Ok(None)
             }
+        } else {
+            debug!("No LAST-MODIFIED for {}", url);
+            Ok(None)
         }
     }