export c fn main() -> i32 {
    let response: Span<u8> = std.mem.span("HTTP/1.1 200 OK\nContent-Type: application/json\nX-Zero: yes\n\nbody")
    let content_type: HttpHeaderValue = std.http.headerValue(response, std.mem.span("content-type"))
    let missing: HttpHeaderValue = std.http.headerValue(response, std.mem.span("missing"))
    let body_offset: usize = std.http.responseBodyOffset(response)
    if std.http.responseHeadersLen(response) != body_offset {
        return 91
    }
    if std.http.responseLen(response) != std.mem.len(response) {
        return 92
    }
    if !std.http.headerFound(content_type) {
        return 93
    }
    if std.http.headerLen(content_type) != 16 {
        return 94
    }
    if response[std.http.headerOffset(content_type)] != 97_u8 {
        return 95
    }
    if response[body_offset] != 98_u8 {
        return 96
    }
    if std.http.headerFound(missing) {
        return 97
    }
    return 29
}