I suspect "ISO-8859-1" make a problem. open-socket-for-uri of (web client) sets encoding of port to "ISO-8859-1". read-response of (web response) also sets encoding of port to "ISO-8859-1". (use-modules ((srfi srfi-11) #:select (let-values)) ((web uri) #:select (string->uri)) ((web client) #:select (http-get))) (let-values (((res-headers res-body) (http-get (string->uri "http://www.gnu.org/home.html") #:extra-headers (acons 'Accept "text/html" (acons 'Accept-Charset "ISO-8859-1" (acons 'Accept-Language "en-US" '())))))) (display res-body) (newline)) Above code makes an error: ... In web/response.scm: 187: 2 [read-response #] In web/http.scm: 218: 1 [lp ((server . "Apache/2.2.14") (date . #))] 184: 0 [read-header #] Same error after changing above "ISO-8859-1" to "utf-8" of course; It's meaningless. (let-values (((res-headers res-body) (http-get (string->uri "http://www.gnu.org/home.html") #:extra-headers (acons 'Accept "text/plain" '())))) (display res-body) (newline)) Above code display this: 406 Not Acceptable

Not Acceptable

An appropriate representation of the requested resource /home.html could not be found on this server.

Available variants:

home.ar.html , type text/html, language ar

version: (1 . 1) code: 406 reason-phrase: "Not Acceptable" headers: ((date . #) (server . "Apache/2.2.14") (alternates . "{\"home.ar.html\" 1 {type text/html} {language ar}}, {\"home.bg.html\" 1 {type text/html} {language bg}}, {\"home.ca.html\" 1 {type text/html} {language ca}}, {\"home.cs.html\" 1 {type text/html} {language cs}}, {\"home.de.html\" 1 {type text/html} {language de}}, {\"home.el.html\" 1 {type text/html} {language el}}, {\"home.es.html\" 1 {type text/html} {language es}}, {\"home.fa.html\" 1 {type text/html} {language fa}}, {\"home.fr.html\" 1 {type text/html} {language fr}}, {\"home.html\" 1 {type text/html} {language en}}, {\"home.id.html\" 1 {type text/html} {language id}}, {\"home.it.html\" 1 {type text/html} {language it}}, {\"home.ja.html\" 1 {type text/html} {language ja}}, {\"home.kn.html\" 1 {type text/html} {language kn}}, {\"home.ko.html\" 1 {type text/html} {language ko}}, {\"home.nb.html\" 1 {type text/html} {language nb}}, {\"home.nl.html\" 1 {type text/html} {language nl}}, {\"home.pl.html\" 1 {type text/html} {language pl}}, {\"home.pt-br.html\" 1 {type text/html} {language pt-br}}, {\"home.ro.html\" 1 {type text/html} {language ro}}, {\"home.ru.html\" 1 {type text/html} {language ru}}, {\"home.sq.html\" 1 {type text/html} {language sq}}, {\"home.sr.html\" 1 {type text/html} {language sr}}, {\"home.tr.html\" 1 {type text/html} {language tr}}, {\"home.uk.html\" 1 {type text/html} {language uk}}, {\"home.zh-cn.html\" 1 {type text/html} {language zh-cn}}") (vary negotiate accept-language accept-encoding) (tcn . "list") (content-length . 2425) (connection close) (content-type text/html (charset . "iso-8859-1"))) port: #>