diff --git a/include/httpcgi.h b/include/httpcgi.h
index 305f491..e85948c 100644
--- a/include/httpcgi.h
+++ b/include/httpcgi.h
@@ -116,7 +116,7 @@ struct httpc {
     double      end;                /* 38 end time in seconds           */
 
     UCHAR       rdw;                /* 40 RDW option                    */
-    UCHAR       unused;             /* 41 available                     */
+    UCHAR       chunked;            /* 41 chunked transfer encoding     */
     short       resp;               /* 42 response code                 */
     CRED        *cred;              /* 44 client credential             */
     UFS         *ufs;               /* 48 UFS handle    (opaque)        */
@@ -125,7 +125,7 @@ struct httpc {
     UCHAR       ssi;                /* 50 Server Side Include enable    */
     UCHAR       ssilevel;           /* 51 SSI processing level          */
 #define SSI_LEVEL_MAX   10          /* ... max SSI processing level     */
-    UCHAR       unused1;            /* 52 available                     */
+    UCHAR       content_length_set; /* 52 Content-Length was sent        */
     UCHAR       unused2;            /* 53 available                     */
     unsigned    unused3;            /* 54 available                     */
 
diff --git a/include/httpd.h b/include/httpd.h
index 5b96f82..c3ca5d3 100644
--- a/include/httpd.h
+++ b/include/httpd.h
@@ -200,7 +200,7 @@ struct httpc {
     double      end;                /* 38 end time in seconds 		*/
 
     UCHAR       rdw;                /* 40 RDW option                */
-    UCHAR       unused;            	/* 41 available                 */
+    UCHAR       chunked;            /* 41 chunked transfer encoding */
     short       resp;               /* 42 response code             */
     CRED    	*cred;              /* 44 client credential      	*/
     UFS         *ufs;               /* 48 UFS handle                */
@@ -209,7 +209,7 @@ struct httpc {
     UCHAR		ssi;				/* 50 Server Side Include enable */
     UCHAR		ssilevel;			/* 51 SSI processing level		*/
 #define SSI_LEVEL_MAX	10			/* ... max SSI processing levele*/
-	UCHAR		unused1;			/* 52 available					*/
+	UCHAR		content_length_set;	/* 52 Content-Length was sent	*/
 	UCHAR		unused2;			/* 53 available					*/
 	unsigned	unused3;			/* 54 available					*/
 
diff --git a/src/httpdone.c b/src/httpdone.c
index b2e9ca5..3f7c4ea 100644
--- a/src/httpdone.c
+++ b/src/httpdone.c
@@ -21,6 +21,19 @@ httpdone(HTTPC *httpc)
         ufs_fclose(&httpc->ufp);
     }
 
+    /* send terminating chunk for chunked transfer encoding */
+    if (httpc->chunked) {
+        /* "0\r\n\r\n" in ASCII — disable framing first */
+        UCHAR term[5];
+        httpc->chunked = 0;
+        term[0] = 0x30;  /* '0' */
+        term[1] = 0x0D;  /* CR  */
+        term[2] = 0x0A;  /* LF  */
+        term[3] = 0x0D;  /* CR  */
+        term[4] = 0x0A;  /* LF  */
+        http_send(httpc, term, 5);
+    }
+
     httpsecs(&httpc->end);
 
 quit:
diff --git a/src/httpget.c b/src/httpget.c
index 25b7328..9aea70e 100644
--- a/src/httpget.c
+++ b/src/httpget.c
@@ -16,6 +16,7 @@ httpget(HTTPC *httpc)
 {
     int         rc      = 0;
     UCHAR       *path;
+    UCHAR       *open_path = NULL;
     const HTTPM *mime;
     FILE        *fp;
     int 		len;
@@ -38,6 +39,7 @@ httpget(HTTPC *httpc)
 
     /* try to open path from UFS */
     mime = http_mime(path);
+    open_path = path;
     fp = http_open(httpc, path, mime);
     if (fp || httpc->ufp) goto okay;
 
@@ -47,11 +49,13 @@ httpget(HTTPC *httpc)
         memcpy(buf, path, len);
         strcpy(&buf[len], "index.html");
         mime = http_mime(buf);
+        open_path = buf;
         fp = http_open(httpc, buf, mime);
         if (fp || httpc->ufp) goto okay;
 
         strcpy(&buf[len], "default.html");
         mime = http_mime(buf);
+        open_path = buf;
         fp = http_open(httpc, buf, mime);
         if (fp || httpc->ufp) goto okay;
     }
@@ -80,8 +84,49 @@ httpget(HTTPC *httpc)
 #endif
     rc = http_printf(httpc, "Content-Type: %s\r\n", mime->type);
     if (rc) goto die;
-    rc = http_printf(httpc, "\r\n");
-    if (rc) goto die;
+
+    /* Content-Length for static UFS files, chunked for SSI */
+    if (!httpc->ssi && httpc->ufp) {
+        UFS *ufs = http_get_ufs(httpc);
+        if (ufs) {
+            UFSDLIST st;
+            UCHAR ufspath[256];
+            const char *dr = httpc->httpd->docroot;
+            if (dr[0]) {
+                snprintf((char *)ufspath, sizeof(ufspath), "%s%s",
+                         dr, open_path);
+            } else {
+                snprintf((char *)ufspath, sizeof(ufspath), "%s", open_path);
+            }
+            if (ufs_stat(ufs, (const char *)ufspath, &st) == 0
+                && st.filesize > 0) {
+                rc = http_printf(httpc, "Content-Length: %u\r\n",
+                                 st.filesize);
+                if (rc) goto die;
+                httpc->content_length_set = 1;
+            }
+        }
+    }
+
+    /* chunked transfer encoding only for HTTP/1.1 clients */
+    {
+        int use_chunked = 0;
+        if (!httpc->content_length_set) {
+            UCHAR *ver = http_get_env(httpc, "REQUEST_VERSION");
+            if (ver && http_cmp(ver, "HTTP/1.1") == 0) {
+                rc = http_printf(httpc, "Transfer-Encoding: chunked\r\n");
+                if (rc) goto die;
+                use_chunked = 1;
+            }
+            /* HTTP/1.0: no chunked, body delimited by Connection: close */
+        }
+
+        rc = http_printf(httpc, "\r\n");
+        if (rc) goto die;
+
+        /* enable chunk framing AFTER header-ending CRLF is sent */
+        httpc->chunked = use_chunked;
+    }
 
     /* indicate type of document being sent */
     if (mime->binary) {
diff --git a/src/httpin.c b/src/httpin.c
index ba203f3..d6c622c 100644
--- a/src/httpin.c
+++ b/src/httpin.c
@@ -71,6 +71,21 @@ int http_in(HTTPC *httpc)
         if (http_set_http_env(httpc, buf, p)) goto failed;
     } while(rc > 0);
 
+    /* HTTP/1.1 requires a Host header */
+    {
+        UCHAR *ver = http_get_env(httpc, "REQUEST_VERSION");
+        if (ver && http_cmp(ver, "HTTP/1.1") == 0) {
+            UCHAR *host = http_get_env(httpc, "HTTP_HOST");
+            if (!host || !host[0]) {
+                http_resp(httpc, 400);
+                http_printf(httpc, "Content-Type: text/plain\r\n\r\n");
+                http_printf(httpc, "400 Bad Request: Missing Host header\r\n");
+                httpc->state = CSTATE_DONE;
+                goto quit;
+            }
+        }
+    }
+
     /* next step will parse and do any additional processing */
     rc = 0;
     httpc->state = CSTATE_PARSE;
diff --git a/src/httppars.c b/src/httppars.c
index 830ca7c..b1960eb 100644
--- a/src/httppars.c
+++ b/src/httppars.c
@@ -87,7 +87,7 @@ httppars(HTTPC *httpc)
         if (http_set_env(httpc, "SERVER_PORT", tmp)) goto failed;
     }
 
-    if (http_set_env(httpc, "SERVER_PROTOCOL", "HTTP/1.0")) goto failed;
+    if (http_set_env(httpc, "SERVER_PROTOCOL", "HTTP/1.1")) goto failed;
     
     sprintf(tmp, "HTTPD/%s", httpc->httpd->version);
     if (http_set_env(httpc, "SERVER_SOFTWARE", tmp)) goto failed;
diff --git a/src/httprese.c b/src/httprese.c
index d1b6db0..ac56bfd 100644
--- a/src/httprese.c
+++ b/src/httprese.c
@@ -31,6 +31,8 @@ httprese(HTTPC *httpc)
     httpc->sent = 0;
     httpc->subtype = 0;
     httpc->substate = 0;
+    httpc->chunked = 0;
+    httpc->content_length_set = 0;
     httpc->start = 0.0;
     httpc->end = 0.0;
     memset(httpc->buf, 0, CBUFSIZE);
diff --git a/src/httpresp.c b/src/httpresp.c
index 7c9cc82..a39fb9d 100644
--- a/src/httpresp.c
+++ b/src/httpresp.c
@@ -42,7 +42,15 @@ httpresp(HTTPC *httpc, int resp)
 
     httpc->resp = resp;
 
-    rc = http_printf(httpc, "HTTP/1.0 %s\r\n", p);
+    /* match response version to client request version */
+    {
+        UCHAR *ver = http_get_env(httpc, "REQUEST_VERSION");
+        if (ver && http_cmp(ver, "HTTP/1.1") == 0) {
+            rc = http_printf(httpc, "HTTP/1.1 %s\r\n", p);
+        } else {
+            rc = http_printf(httpc, "HTTP/1.0 %s\r\n", p);
+        }
+    }
     if (rc) goto quit;
 
 	now = time64(NULL);
@@ -68,6 +76,10 @@ httpresp(HTTPC *httpc, int resp)
 		if (rc) goto quit;
 	}
 
+    /* HTTP/1.1: always close for now (keep-alive planned) */
+    rc = http_printf(httpc, "Connection: close\r\n");
+    if (rc) goto quit;
+
 quit:
     http_exit("httpresp(), rc=%d\n", rc);
     return rc;
diff --git a/src/httpsend.c b/src/httpsend.c
index f294ae4..f3ecf22 100644
--- a/src/httpsend.c
+++ b/src/httpsend.c
@@ -4,62 +4,74 @@
 */
 #include "httpd.h"
 
-extern int
-httpsend(HTTPC *httpc, const UCHAR *buf, int len)
+/* send_raw() - send raw bytes to socket without chunk framing */
+static int
+send_raw(HTTPC *httpc, const UCHAR *buf, int len)
 {
     int rc;
     int pos = 0;
 
-#if 0
-    wtof("httpsend(%08X,%08X,%d)", httpc, buf, len);
-#endif
-
-    /* send data to socket */
     for(pos=0; pos < len; pos+=rc) {
         if (pos < 0) {
             wtof("httpsend() pos underflow %d", pos);
             break;
         }
-#if 0
-        wtof("calling send(%d,%08X,%d,0)",
-            httpc->socket, &buf[pos], len-pos);
-#endif
         rc = send(httpc->socket, &buf[pos], len-pos, 0);
-#if 0
-        wtof("send() rc=%d", rc);
-#endif
         if (rc>0) {
-            /* update bytes sent count */
             httpc->sent += rc;
-#if 0
-            wtof("httpc->sent=%d", httpc->sent);
-#endif
         }
         else {
-#if 0
-            wtof("httpsend() send rc=%d, errno=%d, socket=%d", rc, errno, httpc->socket);
-#endif
             /* allow for EWOULDBLOCK */
             if (errno == EWOULDBLOCK) break;
 
             /* an error occured */
             if (httpc->state < CSTATE_DONE) {
-                /* transtion to done state */
-#if 0
-                wtof("httpsend() changing httpc->state=CSTATE_DONE");
-#endif
                 httpc->state = CSTATE_DONE;
-                goto quit;  /* return with negative rc */
+                return -1;
             }
             break;
         }
     }
 
-    rc = pos;
+    return pos;
+}
+
+extern int
+httpsend(HTTPC *httpc, const UCHAR *buf, int len)
+{
+    int rc;
+
+    if (httpc->chunked) {
+        /* RFC 7230 chunked transfer encoding */
+        UCHAR hdr[16];
+        int hdrlen;
+
+        if (len <= 0) return 0;
+
+        /* chunk header: hex size + CRLF (convert EBCDIC to ASCII) */
+        hdrlen = sprintf((char *)hdr, "%x\r\n", len);
+        http_etoa(hdr, hdrlen);
+        rc = send_raw(httpc, hdr, hdrlen);
+        if (rc < 0) return rc;
+
+        /* chunk data (already in ASCII from caller) */
+        rc = send_raw(httpc, buf, len);
+        if (rc < 0) return rc;
+
+        /* chunk trailer: CRLF in ASCII (0x0D 0x0A) */
+        {
+            UCHAR crlf[2];
+            crlf[0] = 0x0D;
+            crlf[1] = 0x0A;
+            rc = send_raw(httpc, crlf, 2);
+        }
+        if (rc < 0) return rc;
+
+        return len;
+    }
+
+    /* non-chunked: send raw */
+    rc = send_raw(httpc, buf, len);
 
-quit:
-#if 0
-    wtof("httpsend() rc=%d", rc);
-#endif
     return rc;
 }