diff --git a/cmd/http/main.ha b/cmd/http/main.ha
new file mode 100644
index 0000000..8c05575
--- /dev/null
+++ b/cmd/http/main.ha
@@ -0,0 +1,21 @@
+use net::http;
+use net::ip;
+use net::uri;
+use os;
+
+export fn main() void = {
+	const req = &http::request {
+		method = http::GET,
+		target = &uri::uri {
+			scheme = "http",
+			host = ip::LOCAL_V6,
+			path = "/",
+			...
+		},
+		body = void,
+		...
+	};
+	http::add_header(&req.header, "User-Agent", "Hare test client");
+	http::add_header(&req.header, "Content-Length", "100");
+	http::write_header(os::stdout, &req.header)!;
+};
diff --git a/net/http/README b/net/http/README
new file mode 100644
index 0000000..1045060
--- /dev/null
+++ b/net/http/README
@@ -0,0 +1,8 @@
+TODO: Flesh me out
+
+Caveats:
+
+- No attempt is made to validate that the input for client requests or responses
+  are valid according to the HTTP grammar; such cases will fail when rejected by
+  the other party.
+- Details indicated by RFC 7230 et al as "obsolete" are not implemented
diff --git a/net/http/header.ha b/net/http/header.ha
new file mode 100644
index 0000000..12f8200
--- /dev/null
+++ b/net/http/header.ha
@@ -0,0 +1,42 @@
+use io;
+use fmt;
+
+// List of HTTP headers.
+export type header = [](str, str);
+
+// Adds a given HTTP header, which may be added more than once. The provided
+// name and value are borrowed from the caller. The provided header name should
+// be canonicalized by the caller.
+export fn add_header(head: *header, name: str, val: str) void = {
+	append(head, (name, val));
+};
+
+// Sets the value of a given HTTP header, removing any previous values. The
+// provided name and value are borrowed from the caller. The provided header
+// name should be canonicalized by the caller.
+export fn set_header(head: *header, name: str, val: str) void = {
+	del_header(head, name);
+	add_header(head, name, val);
+};
+
+// Removes an HTTP header from a list of [[header]]. If multiple headers match
+// the given name, all matching headers are removed.
+export fn del_header(head: *header, name: str) void = {
+	for (let i = 0z; i < len(head); i += 1) {
+		if (head[i].0 == name) {
+			delete(head[i]);
+			i -= 1;
+		};
+	};
+};
+
+// Writes a list of HTTP headers to the provided I/O handle in the HTTP wire
+// format.
+export fn write_header(sink: io::handle, head: *header) (size | io::error) = {
+	let z = 0z;
+	for (let i = 0z; i < len(head); i += 1) {
+		const (name, val) = head[i];
+		z += fmt::fprintf(sink, "{}: {}\r\n", name, val)?;
+	};
+	return z;
+};
diff --git a/net/http/request.ha b/net/http/request.ha
index e69de29..d710a81 100644
--- a/net/http/request.ha
+++ b/net/http/request.ha
@@ -0,0 +1,20 @@
+use io;
+use net::uri;
+
+// Stores state related to an HTTP request.
+export type request = struct {
+	// HTTP request method, e.g. GET
+	method: str,
+	// Request target URI.
+	//
+	// Note that the normal constraints for [[uri::parse]] are not upheld in
+	// the case of a request using the origin-form (e.g. /index.html), i.e.
+	// the scheme field may be empty.
+	target: *uri::uri,
+
+	// List of HTTP request headers.
+	header: header,
+
+	// I/O reader for the request body.
+	body: (io::handle | void),
+};