diff --git a/pkgs/net-doc/net/scribblings/http-client.scrbl b/pkgs/net-doc/net/scribblings/http-client.scrbl
index d0ad117443..3bc71f9645 100644
--- a/pkgs/net-doc/net/scribblings/http-client.scrbl
+++ b/pkgs/net-doc/net/scribblings/http-client.scrbl
@@ -98,7 +98,7 @@ configured to @tech{auto-reconnect}.
                           [#:method method (or/c bytes? string? symbol?) #"GET"]
                           [#:close? close? boolean? #f]
                           [#:headers headers (listof (or/c bytes? string?)) empty]
-                          [#:content-decode decodes (listof symbol?) '(gzip)]
+                          [#:content-decode decodes (listof symbol?) '(gzip deflate)]
                           [#:data data (or/c false/c bytes? string? data-procedure/c) #f])
          void?]{
 
@@ -120,15 +120,16 @@ are accepted is automatically added.
 
 If @racket[close?] is @racket[#t] and @racket[headers] does not
 contain a @litchar{Connection} header, then a @litchar{Connection:
-close} header will be added.
+close} header will be added (currently, @racket['gzip] and @racket['deflate] are supported).
 
 This function does not support requests that expect
 @litchar{100 (Continue)} responses.
 
+@history[#:changed "7.6.0.9" @elem{Added support for @racket['deflate] decoding.}]
 }
 
 @defproc[(http-conn-recv! [hc http-conn-liveable?]
-                          [#:content-decode decodes (listof symbol?) '(gzip)]
+                          [#:content-decode decodes (listof symbol?) '(gzip deflate)]
                           [#:method method (or/c bytes? string? symbol?) #"GET"]
                           [#:close? close? boolean? #f])
          (values bytes? (listof bytes?) input-port?)]{
@@ -146,7 +147,9 @@ following the response parsing. If @racket[close?] is @racket[#f],
 then the connection is only closed if the server instructs the client
 to do so.
 
-@history[#:changed "6.1.1.6" @elem{Added the @racket[#:method] argument.}]}
+@history[#:changed "6.1.1.6" @elem{Added the @racket[#:method] argument.}
+         #:changed "7.6.0.9" @elem{Added support for @racket['deflate] decoding.}]
+}
 
 
 @defproc[(http-conn-sendrecv! [hc http-conn-liveable?] [uri (or/c bytes? string?)]
@@ -154,12 +157,13 @@ to do so.
                               [#:method method (or/c bytes? string? symbol?) #"GET"]
                               [#:headers headers (listof (or/c bytes? string?)) empty]
                               [#:data data (or/c false/c bytes? string? data-procedure/c) #f]
-                              [#:content-decode decodes (listof symbol?) '(gzip)]
+                              [#:content-decode decodes (listof symbol?) '(gzip deflate)]
                               [#:close? close? boolean? #f])
          (values bytes? (listof bytes?) input-port?)]{
 
 Calls @racket[http-conn-send!] and @racket[http-conn-recv!] in sequence.
 
+@history[#:changed "7.6.0.9" @elem{Added support for @racket['deflate] decoding.}]
 }
 
 @defproc[(http-sendrecv [host (or/c bytes? string?)] [uri (or/c bytes? string?)]
@@ -169,7 +173,7 @@ Calls @racket[http-conn-send!] and @racket[http-conn-recv!] in sequence.
                         [#:method method (or/c bytes? string? symbol?) #"GET"]
                         [#:headers headers (listof (or/c bytes? string?)) empty]
                         [#:data data (or/c false/c bytes? string? data-procedure/c) #f]
-                        [#:content-decode decodes (listof symbol?) '(gzip)])
+                        [#:content-decode decodes (listof symbol?) '(gzip deflate)])
          (values bytes? (listof bytes?) input-port?)]{
 
 Calls @racket[http-conn-send!] and @racket[http-conn-recv!] in
@@ -180,6 +184,7 @@ The HTTP connection is not returned, so it is always closed after one
 response, which is why there is no @racket[#:closed?] argument like
 @racket[http-conn-recv!].
 
+@history[#:changed "7.6.0.9" @elem{Added support for @racket['deflate] decoding.}]
 }
 
 @defproc[(http-conn-CONNECT-tunnel [proxy-host (or/c bytes? string?)]
diff --git a/pkgs/net-doc/net/scribblings/url.scrbl b/pkgs/net-doc/net/scribblings/url.scrbl
index 937b62f7d4..bfb7d20b2b 100644
--- a/pkgs/net-doc/net/scribblings/url.scrbl
+++ b/pkgs/net-doc/net/scribblings/url.scrbl
@@ -596,14 +596,14 @@ and @racket[host], or @racket[#f] if no proxy is to be used.}
                             [#:method method (or/c bytes? string? symbol?) #"GET"]
                             [#:headers headers (listof (or/c bytes? string?)) empty]
                             [#:data data (or/c false/c bytes? string? data-procedure/c) #f]
-                            [#:content-decode decodes (listof symbol?) '(gzip)])
+                            [#:content-decode decodes (listof symbol?) '(gzip deflate)])
          (values bytes? (listof bytes?) input-port?)]{
 
 Calls @racket[http-sendrecv] using @racket[u] to populate the host, URI, port, and SSL parameters.
 
 This function does not support proxies.
                                                       
-}
+@history[#:changed "7.6.0.9" @elem{Added support for @racket['deflate] decoding.}]}
 
 @defproc[(tcp-or-tunnel-connect [scheme string?]
                                 [host string?]
diff --git a/pkgs/net-test/tests/net/http-client.rkt b/pkgs/net-test/tests/net/http-client.rkt
index 12ea2b1b21..12f4435491 100644
--- a/pkgs/net-test/tests/net/http-client.rkt
+++ b/pkgs/net-test/tests/net/http-client.rkt
@@ -81,7 +81,7 @@
 
   (define-syntax (test stx)
     (syntax-case stx ()
-      [(_ method body raw ereq estatus eheaders econtent)
+      [(_ method body raw ereq estatus eheaders econtent extra ...)
        (quasisyntax/loc stx
          (begin
            #,(syntax/loc stx
@@ -93,7 +93,8 @@
                                            #:port the-port
                                            #:method method
                                            #:headers empty
-                                           #:data body))
+                                           #:data body
+                                           extra ...))
                        raw ereq estatus eheaders econtent))
            #,(syntax/loc stx
                (test-e the-port
@@ -109,7 +110,8 @@
                                                #:method method
                                                #:headers empty
                                                #:close? #t
-                                               #:data body)
+                                               #:data body
+                                               extra ...)
                            (begin0
                             (hc:http-conn-recv! c
                                                 #:method method
@@ -133,7 +135,8 @@
                                              #:method method
                                              #:headers empty
                                              #:close? #t
-                                             #:data body)
+                                             #:data body
+                                             extra ...)
                          (begin0
                           (hc:http-conn-recv! c
                                               #:method method
@@ -150,132 +153,154 @@
                                       (list (u:path/param "" empty)) empty #f)
                           #:method method
                           #:headers empty
-                          #:data body))
+                          #:data body
+                          extra ...))
                        raw ereq estatus eheaders econtent))))]))
 
   (tests
    ["GET" #f "HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\nTransfer-Encoding: chunked\r\n\r\n24\r\nThis is the data in the first chunk \r\n1A\r\nand this is the second one\r\n0\r\n"
-    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
+    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip,deflate\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
     #"HTTP/1.1 200 OK"
     '(#"Content-Type: text/plain" #"Transfer-Encoding: chunked")
     #"This is the data in the first chunk and this is the second one"]
 
-   ["GET" #f "HTTP/1.0 200 OK\r\nContent-Type: text/plain\r\n\r\nThis is the data in the first chunk and this is the second one"
+   ["GET" #f "HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\nTransfer-Encoding: chunked\r\n\r\n24\r\nThis is the data in the first chunk \r\n1A\r\nand this is the second one\r\n0\r\n"
     #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
+    #"HTTP/1.1 200 OK"
+    '(#"Content-Type: text/plain" #"Transfer-Encoding: chunked")
+    #"This is the data in the first chunk and this is the second one"
+    #:content-decode '(gzip)]
+
+   ["GET" #f "HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\nTransfer-Encoding: chunked\r\n\r\n24\r\nThis is the data in the first chunk \r\n1A\r\nand this is the second one\r\n0\r\n"
+    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: deflate\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
+    #"HTTP/1.1 200 OK"
+    '(#"Content-Type: text/plain" #"Transfer-Encoding: chunked")
+    #"This is the data in the first chunk and this is the second one"
+    #:content-decode '(deflate)]
+
+   ["GET" #f "HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\nTransfer-Encoding: chunked\r\n\r\n24\r\nThis is the data in the first chunk \r\n1A\r\nand this is the second one\r\n0\r\n"
+    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
+    #"HTTP/1.1 200 OK"
+    '(#"Content-Type: text/plain" #"Transfer-Encoding: chunked")
+    #"This is the data in the first chunk and this is the second one"
+    #:content-decode '()]
+
+   ["GET" #f "HTTP/1.0 200 OK\r\nContent-Type: text/plain\r\n\r\nThis is the data in the first chunk and this is the second one"
+    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip,deflate\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
     #"HTTP/1.0 200 OK"
     '(#"Content-Type: text/plain")
     #"This is the data in the first chunk and this is the second one"]
 
    ["GET" #f "HTTP/1.0 200 OK\nContent-Type: text/plain\n\nThis is the data in the first chunk and this is the second one"
-    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
+    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip,deflate\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
     #"HTTP/1.0 200 OK"
     '(#"Content-Type: text/plain")
     #"This is the data in the first chunk and this is the second one"]
 
    ["GET" #f "HTTP/1.0 200 OK\r\nContent-Type: text/plain\r\nContent-Length: 62\r\n\r\nThis is the data in the first chunk and this is the second one"
-    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
+    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip,deflate\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
     #"HTTP/1.0 200 OK"
     '(#"Content-Type: text/plain" #"Content-Length: 62")
     #"This is the data in the first chunk and this is the second one"]
 
    ["GET" #f "HTTP/1.0 200 OK\r\nContent-Type: text/plain\r\n\r\nThis is the data in the first chunk and this is the second one"
-    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
+    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip,deflate\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
     #"HTTP/1.0 200 OK"
     '(#"Content-Type: text/plain")
     #"This is the data in the first chunk and this is the second one"]
 
    ["GET" #f "HTTP/1.0 200 OK\r\nContent-Type: text/plain\r\ncontent-length: 62\r\n\r\nThis is the data in the first chunk and this is the second one"
-    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
+    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip,deflate\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
     #"HTTP/1.0 200 OK"
     '(#"Content-Type: text/plain" #"content-length: 62")
     #"This is the data in the first chunk and this is the second one"]
 
    ["GET" #f "HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\nTransfer-Encoding: chunked\r\n\r\n20\r\nThis is the data in the first ch\r\n21\r\nand this is the second oneXXXXXXX\r\n0\r\n"
-    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
+    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip,deflate\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
     #"HTTP/1.1 200 OK"
     '(#"Content-Type: text/plain" #"Transfer-Encoding: chunked")
     #"This is the data in the first chand this is the second oneXXXXXXX"]
 
    ["GET" #f "HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\nTransfer-Encoding: chunked\r\n\r\n24\r\nThis is the data in the first chunk \r\n1A\r\nand this is the second one\r\n0\r\n"
-    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
+    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip,deflate\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
     #"HTTP/1.1 200 OK"
     '(#"Content-Type: text/plain" #"Transfer-Encoding: chunked")
     #"This is the data in the first chunk and this is the second one"]
 
    ["GET" #f "HTTP/1.0 200 OK\r\nContent-Type: text/plain\r\n\r\nThis is the data in the first chunk and this is the second one"
-    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
+    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip,deflate\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
     #"HTTP/1.0 200 OK"
     '(#"Content-Type: text/plain")
     #"This is the data in the first chunk and this is the second one"]
 
    ["GET" #f "HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\nTransfer-Encoding: chunked\r\n\r\n20\r\nThis is the data in the first ch\r\n21\r\nand this is the second oneXXXXXXX\r\n0\r\n"
-    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
+    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip,deflate\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
     #"HTTP/1.1 200 OK"
     '(#"Content-Type: text/plain" #"Transfer-Encoding: chunked")
     #"This is the data in the first chand this is the second oneXXXXXXX"]
 
    ["GET" #f "HTTP/1.0 200 OK\r\nContent-Type: text/plain\r\n\r\nThis is the data in the first chunk and this is the second one\r\n"
-    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
+    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip,deflate\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
     #"HTTP/1.0 200 OK"
     '(#"Content-Type: text/plain")
     #"This is the data in the first chunk and this is the second one\r\n"]
 
    ["GET" #f "HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\nTransfer-Encoding: chunked\r\n\r\n24\r\nThis is the data in the first chunk \r\n1A\r\nand this is the second one\r\n0\r\n"
-    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
+    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip,deflate\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
     #"HTTP/1.1 200 OK"
     '(#"Content-Type: text/plain" #"Transfer-Encoding: chunked")
     #"This is the data in the first chunk and this is the second one"]
 
    ["GET" #f "HTTP/1.0 200 OK\r\nContent-Type: text/plain\r\n\r\nThis is the data in the first chunk and this is the second one"
-    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
+    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip,deflate\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
     #"HTTP/1.0 200 OK"
     '(#"Content-Type: text/plain")
     #"This is the data in the first chunk and this is the second one"]
 
    ["GET" #f "HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\nTransfer-Encoding: chunked\r\n\r\n20\r\nThis is the data in the first ch\r\n21\r\nand this is the second oneXXXXXXX\r\n0\r\n"
-    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
+    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip,deflate\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
     #"HTTP/1.1 200 OK"
     '(#"Content-Type: text/plain" #"Transfer-Encoding: chunked")
     #"This is the data in the first chand this is the second oneXXXXXXX"]
 
    ["GET" #f "HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\nTransfer-Encoding: chunked\r\nAnother-Header: ta-daa\r\n\r\n20\r\nThis is the data in the first ch\r\n21\r\nand this is the second oneXXXXXXX\r\n0\r\n"
-    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
+    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip,deflate\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
     #"HTTP/1.1 200 OK"
     '(#"Content-Type: text/plain" #"Transfer-Encoding: chunked" #"Another-Header: ta-daa")
     #"This is the data in the first chand this is the second oneXXXXXXX"]
 
    ["GET" #f "HTTP/1.1 301 Moved Permanently\r\nLocation: http://localhost:9002/whatever\r\n\r\nstuff"
-    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
+    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip,deflate\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
     #"HTTP/1.1 301 Moved Permanently"
     '(#"Location: http://localhost:9002/whatever")
     #"stuff"]
 
    ["GET" #f "HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\nTransfer-Encoding: chunked\r\nAnother-Header: ta-daa\r\n\r\n20\r\nThis is the data in the first ch\r\n21\r\nand this is the second oneXXXXXXX\r\n0\r\n"
-    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
+    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip,deflate\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
     #"HTTP/1.1 200 OK"
     '(#"Content-Type: text/plain" #"Transfer-Encoding: chunked" #"Another-Header: ta-daa")
     #"This is the data in the first chand this is the second oneXXXXXXX"]
 
    ["GET" #f "HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\nTransfer-Encoding: chunked\r\nAnother-Header: ta-daa\r\n\r\nbb \r\n<HTML>\n\t\t\t\t\t  <HEAD>\n\t\t\t\t\t  <TITLE>ABCNANOTECH Co., LTD.</TITLE>\n\t\t\t\t\t  </HEAD>\n\t\t\t\t\t  <FRAMESET ROWS=\"100%,*\" border=0>\n\t\t\t\t\t  <FRAME src=http://nanotech.co.kr></FRAMESET>\n\t\t\t\t\t  </HTML>\r\n0\r\n\r\n"
-    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
+    #"GET / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip,deflate\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
     #"HTTP/1.1 200 OK"
     '(#"Content-Type: text/plain" #"Transfer-Encoding: chunked" #"Another-Header: ta-daa")
     #"<HTML>\n\t\t\t\t\t  <HEAD>\n\t\t\t\t\t  <TITLE>ABCNANOTECH Co., LTD.</TITLE>\n\t\t\t\t\t  </HEAD>\n\t\t\t\t\t  <FRAMESET ROWS=\"100%,*\" border=0>\n\t\t\t\t\t  <FRAME src=http://nanotech.co.kr></FRAMESET>\n\t\t\t\t\t  </HTML>"]
 
    ["PUT" #f "HTTP/1.1 200 OK\r\n\r\n"
-    #"PUT / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
+    #"PUT / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip,deflate\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
     #"HTTP/1.1 200 OK"
     '()
     #""]
 
    ["PUT" #"frob" "HTTP/1.1 200 OK\r\n\r\n"
-    #"PUT / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip\r\nContent-Length: 4\r\nConnection: close\r\n\r\nfrob"
+    #"PUT / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip,deflate\r\nContent-Length: 4\r\nConnection: close\r\n\r\nfrob"
     #"HTTP/1.1 200 OK"
     '()
     #""]
 
    ["PUT" "frob" "HTTP/1.1 200 OK\r\n\r\n"
-    #"PUT / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip\r\nContent-Length: 4\r\nConnection: close\r\n\r\nfrob"
+    #"PUT / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip,deflate\r\nContent-Length: 4\r\nConnection: close\r\n\r\nfrob"
     #"HTTP/1.1 200 OK"
     '()
     #""]
@@ -283,7 +308,7 @@
    ["PUT"
     (λ (w) (w "fr") (w "ob"))
     "HTTP/1.1 200 OK\r\n\r\n"
-    #"PUT / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip\r\nTransfer-Encoding: chunked\r\nConnection: close\r\n\r\n2\r\nfr\r\n2\r\nob\r\n0\r\n\r\n"
+    #"PUT / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip,deflate\r\nTransfer-Encoding: chunked\r\nConnection: close\r\n\r\n2\r\nfr\r\n2\r\nob\r\n0\r\n\r\n"
     #"HTTP/1.1 200 OK"
     '()
     #""]
@@ -291,13 +316,13 @@
    ["PUT"
     (λ (w) (void))
     "HTTP/1.1 200 OK\r\n\r\n"
-    #"PUT / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip\r\nTransfer-Encoding: chunked\r\nConnection: close\r\n\r\n0\r\n\r\n"
+    #"PUT / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip,deflate\r\nTransfer-Encoding: chunked\r\nConnection: close\r\n\r\n0\r\n\r\n"
     #"HTTP/1.1 200 OK"
     '()
     #""]
 
    ["HEAD" #f "HTTP/1.1 200 OK\r\n\r\n"
-    #"HEAD / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
+    #"HEAD / HTTP/1.1\r\nHost: localhost:REDACTED\r\nUser-Agent: Racket/REDACTED (net/http-client)\r\nAccept-Encoding: gzip,deflate\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
     #"HTTP/1.1 200 OK"
     '()
     #""])
diff --git a/racket/collects/net/http-client.rkt b/racket/collects/net/http-client.rkt
index 0034b62f54..3fab95640f 100644
--- a/racket/collects/net/http-client.rkt
+++ b/racket/collects/net/http-client.rkt
@@ -154,7 +154,7 @@
                          #:method [method-bss #"GET"]
                          #:close? [close? #f]
                          #:headers [headers-bs empty]
-                         #:content-decode [decodes '(gzip)]
+                         #:content-decode [decodes '(gzip deflate)]
                          #:data [data #f])
   (http-conn-enliven! hc)
   (match-define (http-conn host port port-usual? to from _
@@ -168,9 +168,11 @@
   (unless (regexp-member #rx"^(?i:User-Agent:) +.+$" headers-bs)
     (fprintf to "User-Agent: Racket/~a (net/http-client)\r\n" 
              (version)))
-  (unless (or (not (memq 'gzip decodes))
+  (unless (or (empty? decodes)
               (regexp-member #rx"^(?i:Accept-Encoding:) +.+$" headers-bs))
-    (fprintf to "Accept-Encoding: gzip\r\n"))
+    (fprintf to "Accept-Encoding: ~a\r\n"
+             (string-join (map symbol->string decodes) ",")))
+
   (define body (->bytes data))
   (cond [(procedure? body)
          (fprintf to "Transfer-Encoding: chunked\r\n")]
@@ -330,7 +332,7 @@
 
 (define (http-conn-recv! hc
                          #:method [method-bss #"GET"]
-                         #:content-decode [decodes '(gzip)]
+                         #:content-decode [decodes '(gzip deflate)]
                          #:close? [iclose? #f])
   (http-conn-enliven! hc)
   (define status (http-conn-status! hc))
@@ -360,27 +362,34 @@
       [else
        (values (http-conn-response-port/rest! hc) #t)]))
   (define decoded-response-port
-    (cond
-      [(head? method-bss) raw-response-port]
-      [(and (memq 'gzip decodes)
-            (regexp-member #rx#"^(?i:Content-Encoding: +gzip)$" headers)
-            (not (eof-object? (peek-byte raw-response-port))))
-       (define-values (in out) (make-pipe PIPE-SIZE))
-       (define gunzip-t
-         (thread
-          (λ ()
-            (gunzip-through-ports raw-response-port out))))
-       (thread
-        (λ ()
-          (thread-wait gunzip-t)
-          (when wait-for-close?
-            ;; Wait for an EOF from the raw port before we send an
-            ;; output on the decoding pipe:
-            (copy-port raw-response-port (open-output-nowhere)))
-          (close-output-port out)))
-       in]
-      [else 
-       raw-response-port]))
+    (let ([decode-response
+           (λ (raw-response-port decode-function)
+             (define-values (in out) (make-pipe PIPE-SIZE))
+             (define decode-t
+               (thread
+                (λ ()
+                  (decode-function raw-response-port out))))
+             (thread
+              (λ ()
+                (thread-wait decode-t)
+                (when wait-for-close?
+                  ;; Wait for an EOF from the raw port before we send an
+                  ;; output on the decoding pipe:
+                  (copy-port raw-response-port (open-output-nowhere)))
+                (close-output-port out)))
+             in)])
+      (cond
+        [(head? method-bss) raw-response-port]
+        [(and (memq 'gzip decodes)
+              (regexp-member #rx#"^(?i:Content-Encoding: +gzip)$" headers)
+              (not (eof-object? (peek-byte raw-response-port))))
+         (decode-response raw-response-port gunzip-through-ports)]
+        [(and (memq 'deflate decodes)
+              (regexp-member #rx#"^(?i:Content-Encoding: +deflate)$" headers)
+              (not (eof-object? (peek-byte raw-response-port))))
+         (decode-response raw-response-port inflate)]
+        [else
+         raw-response-port])))
   (values status headers decoded-response-port))
 
 (define (http-conn-sendrecv! hc url-bs
@@ -388,7 +397,7 @@
                              #:method [method-bss #"GET"]
                              #:headers [headers-bs empty]
                              #:data [data #f]
-                             #:content-decode [decodes '(gzip)]
+                             #:content-decode [decodes '(gzip deflate)]
                              #:close? [close? #f])
   (http-conn-send! hc url-bs
                    #:version version-bs
@@ -409,7 +418,7 @@
                        #:method [method-bss #"GET"]
                        #:headers [headers-bs empty]
                        #:data [data #f]
-                       #:content-decode [decodes '(gzip)])
+                       #:content-decode [decodes '(gzip deflate)])
   (define hc (http-conn-open host-bs #:ssl? ssl? #:port port))
   (begin0 (http-conn-sendrecv! hc url-bs
                                #:version version-bs
diff --git a/racket/collects/net/url.rkt b/racket/collects/net/url.rkt
index d5928cf47d..8493539289 100644
--- a/racket/collects/net/url.rkt
+++ b/racket/collects/net/url.rkt
@@ -523,7 +523,7 @@
                            #:method [method-bss #"GET"]
                            #:headers [headers-bs empty]
                            #:data [data #f]
-                           #:content-decode [decodes '(gzip)])
+                           #:content-decode [decodes '(gzip deflate)])
   (unless (member (url-scheme u) '(#f "http" "https"))
     (error 'http-sendrecv/url "URL scheme ~e not supported" (url-scheme u)))
   (define ssl?