seanmonstar/warp · warning

test request path invalid

Error message

test request path invalid

What it means

`warp::test::request().path(p)` parses the string into an `http::Uri` and panics with "test request path invalid" if parsing fails (src/test.rs:206). The test builder treats an unparseable URI as a mistake in the test code itself. The panic happens at request-construction time, before any filter runs.

Solutions

1. Percent-encode dynamic path segments (use `urlencoding::encode` or `Url::parse` first) before passing to `.path()`
2. Pre-validate in the test helper: `p.parse::<http::Uri>().expect("test path")` to fail with a clearer message
3. Use absolute-form URIs like "/foo?bar=1" or "http://localhost/foo" and ensure query strings are properly escaped
4. Check for stray whitespace and unencoded spaces — the most common cause

Example fix

// before
let q = "hello world";
warp::test::request().path(format!("/search?q={}", q).as_str());
// after
let q = urlencoding::encode("hello world");
warp::test::request().path(format!("/search?q={}", q).as_str());

fn assert_test_path(p: &str) {
    p.parse::<http::Uri>().unwrap_or_else(|e| panic!("test path '{}' invalid: {}", p, e));
}

fn is_valid_uri(p: &str) -> bool { p.parse::<http::Uri>().is_ok() }

When it happens

Trigger: Calling `.path("http://example.com/path with spaces")`, `.path("")` in contexts where it's rejected, paths with invalid characters ('<', '"', control chars), or full URLs where the Uri grammar rejects the authority/port combination.

Common situations: Interpolating user data or query strings with unencoded characters (spaces, raw UTF-8, unescaped '#') into the test path; concatenating base URLs and paths producing "http://host//path" or missing slashes; platform-dependent path strings pasted from logs.

Understand the failure class

Background: "Invalid URL" errors: why new URL(), URI.parse, and reqwest::Url reject your string — missing scheme, whitespace, and bad path format — this error's family across 39 libraries.

Related errors

• valid method
• websocket handshake thread panicked
• polled after complete
• polled after complete
• polled after complete

AI-assisted analysis of seanmonstar/warp@ff34d7213e (2026-09-09). Data as JSON: /api/errors/fbee605e4ab99662. Report an issue: GitHub.

Appendix: source

Thrown at src/test.rs:206

    }

    /// Sets the request path of this builder.
    ///
    /// The default is not set is `/`.
    ///
    /// # Example
    ///
    /// ```
    /// let req = warp::test::request()
    ///     .path("/todos/33");
    /// ```
    ///
    /// # Panic
    ///
    /// This panics if the passed string is not able to be parsed as a valid
    /// `Uri`.
    pub fn path(mut self, p: &str) -> Self {
        let uri = p.parse().expect("test request path invalid");
        *self.req.uri_mut() = uri;
        self
    }

    /// Set a header for this request.
    ///
    /// # Example
    ///
    /// ```
    /// let req = warp::test::request()
    ///     .header("accept", "application/json");
    /// ```
    ///
    /// # Panic
    ///
    /// This panics if the passed strings are not able to be parsed as a valid
    /// `HeaderName` and `HeaderValue`.
    pub fn header<K, V>(mut self, key: K, value: V) -> Self

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