diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index 6877334..bde6b27 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -13,7 +13,7 @@
             "state": {
               "type": "markdown",
               "state": {
-                "file": "UNB/Year 4/Semester 2/STAT2593/2024-01-29.md",
+                "file": "UNB/Year 4/Semester 2/CS3873/2024-01-29.md",
                 "mode": "source",
                 "source": false
               }
@@ -85,7 +85,7 @@
             "state": {
               "type": "backlink",
               "state": {
-                "file": "UNB/Year 4/Semester 2/STAT2593/2024-01-29.md",
+                "file": "UNB/Year 4/Semester 2/CS3873/2024-01-29.md",
                 "collapseAll": false,
                 "extraContext": false,
                 "sortOrder": "alphabetical",
@@ -102,7 +102,7 @@
             "state": {
               "type": "outgoing-link",
               "state": {
-                "file": "UNB/Year 4/Semester 2/STAT2593/2024-01-29.md",
+                "file": "UNB/Year 4/Semester 2/CS3873/2024-01-29.md",
                 "linksCollapsed": false,
                 "unlinkedCollapsed": true
               }
@@ -125,7 +125,7 @@
             "state": {
               "type": "outline",
               "state": {
-                "file": "UNB/Year 4/Semester 2/STAT2593/2024-01-29.md"
+                "file": "UNB/Year 4/Semester 2/CS3873/2024-01-29.md"
               }
             }
           },
@@ -159,6 +159,7 @@
   "active": "4512014e685326f2",
   "lastOpenFiles": [
     "UNB/Year 4/Semester 2/STAT2593/2024-01-29.md",
+    "UNB/Year 4/Semester 2/CS3873/2024-01-29.md",
     "UNB/Year 4/Semester 2/STAT2593/2024-01-26.md",
     "UNB/Year 4/Semester 2/CS2333/2024-01-24.md",
     "UNB/Year 4/Semester 2/CS3873/2024-01-26.md",
@@ -190,7 +191,6 @@
     "Semester 2/CS2333",
     "Semester 1/CS3418/Exam Studying.md",
     "Semester 2/CS3873",
-    "Semester 1/CS3418/11-27-2023.md",
     "Semester 1/CS2418",
     "Semester 1/CS3418"
   ]
diff --git a/UNB/Year 4/Semester 2/CS3873/2024-01-29.md b/UNB/Year 4/Semester 2/CS3873/2024-01-29.md
new file mode 100644
index 0000000..54f6032
--- /dev/null
+++ b/UNB/Year 4/Semester 2/CS3873/2024-01-29.md	
@@ -0,0 +1,17 @@
+Lecture Topic: HTTP
+
+# Conditional Get
+## Last-Modified
+You can check the Last-Modified header to only get contents if the contents are newer than the contents of the cache
+## ETag
+Use the hash of an object to check for modification to solve cache invalidation problem
+
+## TCP and HTTP
+HTTP runs on top of TCP
+- Client initiates TCP request to server
+- Server accepts TCP connection
+- Clint confirms request
+- Three way handshake
+
+## Non-persistent HTTP
+RTT = Round trip time