Add error message for unsupported HTTP version.

integration/tests_failed/http_version_not_supported.err

@@ -0,0 +1,7 @@
+error: Unsupported HTTP version
+  --> tests_failed/http_version_not_supported.hurl:3:5
+   |
+ 3 | GET http://localhost:8000/foo
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^ HTTP/3 is not supported, check --version
+   |
+

integration/tests_failed/http_version_not_supported.exit

@@ -0,0 +1 @@
+3

integration/tests_failed/http_version_not_supported.html

@@ -0,0 +1,5 @@
+<pre><code class="language-hurl"><span class="hurl-entry"><span class="request"><span class="line"></span><span class="comment"># This test is run when the libcurl used by Hurl doesn't support HTTP/3 so it should failed with</span>
+<span class="line"></span><span class="comment"># an appropriate error message.</span>
+<span class="line"><span class="method">GET</span> <span class="url">http://localhost:8000/foo</span></span>
+</span><span class="response"><span class="line"><span class="version">HTTP</span> <span class="number">200</span></span>
+</span></span></code></pre>

integration/tests_failed/http_version_not_supported.hurl

@@ -0,0 +1,4 @@
+# This test is run when the libcurl used by Hurl doesn't support HTTP/3 so it should failed with
+# an appropriate error message.
+GET http://localhost:8000/foo
+HTTP 200

integration/tests_failed/http_version_not_supported.json

@@ -0,0 +1 @@
+{"entries":[{"request":{"method":"GET","url":"http://localhost:8000/foo"},"response":{"status":200}}]}

integration/tests_failed/http_version_not_supported.ps1

@@ -0,0 +1,11 @@
+Set-StrictMode -Version latest
+$ErrorActionPreference = 'Stop'
+
+$ErrorActionPreference = 'Continue'
+curl --version | grep Features | grep -q HTTP3
+if ($LASTEXITCODE -eq 0) {
+  exit 255
+}
+$ErrorActionPreference = 'Stop'
+
+hurl --http3 tests_failed/http_version_not_supported.hurl

integration/tests_failed/http_version_not_supported.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+set -Eeuo pipefail
+
+set +eo pipefail
+if (curl --version | grep Features | grep -q HTTP3); then
+  exit 255
+fi
+set -Eeuo pipefail
+
+hurl --http3 tests_failed/http_version_not_supported.hurl

packages/hurl/src/http/client.rs

@@ -21,8 +21,8 @@ use std::str::FromStr;
 use base64::engine::general_purpose;
 use base64::Engine;
 use chrono::Utc;
-use curl::easy;
 use curl::easy::{List, SslOpt};
+use curl::{easy, Version};
 use encoding::all::ISO_8859_1;
 use encoding::{DecoderTrap, Encoding};
 use url::Url;
@@ -48,6 +48,9 @@ pub struct Client {
     handle: Box<easy::Easy>,
     /// Current State
     state: ClientState,
+    /// HTTP version support
+    http2: bool,
+    http3: bool,
 }
 
 /// Represents the state of the HTTP client.
@@ -78,10 +81,13 @@ impl ClientState {
 impl Client {
     /// Creates HTTP Hurl client.
     pub fn new() -> Client {
-        let h = easy::Easy::new();
+        let handle = easy::Easy::new();
+        let version = Version::get();
         Client {
-            handle: Box::new(h),
+            handle: Box::new(handle),
             state: ClientState::default(),
+            http2: version.feature_http2(),
+            http3: version.feature_http3(),
         }
     }
 
@@ -157,6 +163,30 @@ impl Client {
         // way to get access to the outgoing headers.
         self.handle.verbose(true)?;
 
+        // We checks libcurl HTTP version support.
+        let http_version = options.http_version;
+        if (http_version == RequestedHttpVersion::Http2 && !self.http2)
+            || (http_version == RequestedHttpVersion::Http3 && !self.http3)
+        {
+            return Err(HttpError::UnsupportedHttpVersion(http_version));
+        }
+
+        // libcurl tries to reuse connections as much as possible (see <https://curl.se/libcurl/c/CURLOPT_HTTP_VERSION.html>)
+        // That's why an `handle` initiated with a HTTP 2 version may keep using HTTP 2 protocol
+        // even if we ask to switch to HTTP 3 in the same session (using `[Options]` section for
+        // instance).
+        // > Note that the HTTP version is just a request. libcurl still prioritizes to reuse
+        // > existing connections so it might then reuse a connection using a HTTP version you
+        // > have not asked for.
+        //
+        // So, if we detect a change of requested HTTP version, we force libcurl to refresh its
+        // connections (see <https://curl.se/libcurl/c/CURLOPT_FRESH_CONNECT.html>)
+        self.state.set_requested_http_version(http_version);
+        if self.state.has_changed() {
+            logger.debug("Force refreshing connections because requested HTTP version change");
+            self.handle.fresh_connect(true)?;
+        }
+
         // Activates the access of certificates info chain after a transfer has been executed.
         self.handle.certinfo(true)?;
 
@@ -192,23 +222,6 @@ impl Client {
         self.handle.timeout(options.timeout)?;
         self.handle.connect_timeout(options.connect_timeout)?;
 
-        // libcurl tries to reuse connections as much as possible (see <https://curl.se/libcurl/c/CURLOPT_HTTP_VERSION.html>)
-        // That's why an `handle` initiated with a HTTP 2 version may keep using HTTP 2 protocol
-        // even if we ask to switch to HTTP 3 in the same session (using `[Options]` section for
-        // instance).
-        // > Note that the HTTP version is just a request. libcurl still prioritizes to reuse
-        // > existing connections so it might then reuse a connection using a HTTP version you
-        // > have not asked for.
-        //
-        // So, if we detect a change of requested HTTP version, we force libcurl to refresh its
-        // connections (see <https://curl.se/libcurl/c/CURLOPT_FRESH_CONNECT.html>)
-        self.state.set_requested_http_version(options.http_version);
-        if self.state.has_changed() {
-            logger.debug("Force refreshing connections because requested HTTP version change");
-            self.handle.fresh_connect(true)?;
-        }
-        self.handle.http_version(options.http_version.into())?;
-
         self.set_ssl_options(options.ssl_no_revoke)?;
 
         let url = self.generate_url(&request_spec.url, &request_spec.querystring);

packages/hurl/src/http/error.rs

@@ -16,6 +16,8 @@
 *
 */
 
+use crate::http::RequestedHttpVersion;
+
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub enum HttpError {
     CouldNotParseResponse,
@@ -45,6 +47,7 @@ pub enum HttpError {
     UnsupportedContentEncoding {
         description: String,
     },
+    UnsupportedHttpVersion(RequestedHttpVersion),
     InvalidUrl(String),
     InvalidUrlPrefix(String),
 }

packages/hurl/src/http/request.rs

@@ -15,6 +15,7 @@
  * limitations under the License.
  *
  */
+use std::fmt;
 use url::Url;
 
 use crate::http::core::*;
@@ -38,6 +39,19 @@ pub enum RequestedHttpVersion {
     Http3,
 }
 
+impl fmt::Display for RequestedHttpVersion {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        let value = match self {
+            RequestedHttpVersion::Default => "HTTP (default)",
+            RequestedHttpVersion::Http10 => "HTTP/1.0",
+            RequestedHttpVersion::Http11 => "HTTP/1.1",
+            RequestedHttpVersion::Http2 => "HTTP/2",
+            RequestedHttpVersion::Http3 => "HTTP/3",
+        };
+        write!(f, "{value}")
+    }
+}
+
 impl Request {
     /// Extracts query string params from the url of the request.
     pub fn query_string_params(&self) -> Vec<Param> {

packages/hurl/src/runner/core.rs

@@ -19,7 +19,7 @@ use std::path::PathBuf;
 
 use hurl_core::ast::SourceInfo;
 
-use crate::http::{Call, Cookie};
+use crate::http::{Call, Cookie, RequestedHttpVersion};
 use crate::runner::value::Value;
 
 #[derive(Clone, Debug, PartialEq, Eq)]
@@ -132,6 +132,7 @@ pub enum RunnerError {
     SslCertificate(String),
 
     UnsupportedContentEncoding(String),
+    UnsupportedHttpVersion(RequestedHttpVersion),
     CouldNotUncompressResponse(String),
 
     FileReadAccess {

packages/hurl/src/runner/error.rs

@@ -61,6 +61,7 @@ impl Error for runner::Error {
             RunnerError::UnrenderableVariable { .. } => "Unrenderable variable".to_string(),
             RunnerError::NoQueryResult => "No query result".to_string(),
             RunnerError::UnsupportedContentEncoding(..) => "Decompression error".to_string(),
+            RunnerError::UnsupportedHttpVersion(..) => "Unsupported HTTP version".to_string(),
             RunnerError::CouldNotUncompressResponse(..) => "Decompression error".to_string(),
             RunnerError::InvalidJson { .. } => "Invalid JSON".to_string(),
             RunnerError::UnauthorizedFileAccess { .. } => "Unauthorized file access".to_string(),
@@ -143,6 +144,10 @@ impl Error for runner::Error {
             RunnerError::UnsupportedContentEncoding(algorithm) => {
                 format!("compression {algorithm} is not supported")
             }
+            RunnerError::UnsupportedHttpVersion(version) => {
+                format!("{version} is not supported, check --version")
+            }
+
             RunnerError::CouldNotUncompressResponse(algorithm) => {
                 format!("could not uncompress response with {algorithm}")
             }
@@ -206,6 +211,9 @@ impl From<HttpError> for RunnerError {
             HttpError::UnsupportedContentEncoding { description } => {
                 RunnerError::UnsupportedContentEncoding(description)
             }
+            HttpError::UnsupportedHttpVersion(version) => {
+                RunnerError::UnsupportedHttpVersion(version)
+            }
             HttpError::InvalidUrl(url) => RunnerError::InvalidUrl(url),
             HttpError::InvalidUrlPrefix(url) => RunnerError::InvalidUrlPrefix(url),
         }