{"record":{"id":"31f7f0b9fb8810d3","repo":"zed-industries/zed","slug":"non-ascii-header-value-for-name","errorCode":null,"errorMessage":"non-ASCII header value for {name}","messagePattern":"non-ASCII header value for (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/gpui_web/src/http_client.rs","lineNumber":142,"sourceCode":"                init.set_redirect(web_sys::RequestRedirect::Follow);\n            }\n        }\n    }\n\n    if let Some(ref bytes) = body_bytes {\n        let uint8array = js_sys::Uint8Array::from(bytes.as_slice());\n        init.set_body(uint8array.as_ref());\n    }\n\n    let url = parts.uri.to_string();\n    let request = web_sys::Request::new_with_str_and_init(&url, &init)\n        .map_err(|error| anyhow!(\"failed to create fetch Request: {error:?}\"))?;\n\n    let request_headers = request.headers();\n    for (name, value) in &parts.headers {\n        let value_str = value\n            .to_str()\n            .map_err(|_| anyhow!(\"non-ASCII header value for {name}\"))?;\n        request_headers\n            .set(name.as_str(), value_str)\n            .map_err(|error| anyhow!(\"failed to set header {name}: {error:?}\"))?;\n    }\n\n    let promise =\n        global_fetch(&request).map_err(|error| anyhow!(\"fetch threw an error: {error:?}\"))?;\n    let response_value = wasm_bindgen_futures::JsFuture::from(promise)\n        .await\n        .map_err(|error| anyhow!(\"fetch failed: {error:?}\"))?;\n\n    let web_response: web_sys::Response = response_value\n        .dyn_into()\n        .map_err(|error| anyhow!(\"fetch result is not a Response: {error:?}\"))?;\n\n    let status = web_response.status();\n    let mut builder = http_client::http::Response::builder().status(status);\n","sourceCodeStart":124,"sourceCodeEnd":160,"githubUrl":"https://github.com/zed-industries/zed/blob/f4178619acd0d47ea1f76a2025c42962c6d6638c/crates/gpui_web/src/http_client.rs#L124-L160","documentation":"Guard in the wasm fetch header loop: HeaderValue::to_str() failed for a header, meaning the value contains non-ASCII/invalid bytes that a JS Headers object cannot store. The message names the offending header; HTTP/2-style binary header values are not representable in browser fetch.","triggerScenarios":"Thrown at crates/gpui_web/src/http_client.rs:142 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Encode binary header values as ASCII (e.g. base64) before sending from wasm","Reject or strip non-ASCII headers at the API boundary with a clear error","For protocols needing binary headers (HTTP/2), use a proxy that accepts them server-side"],"exampleFix":null,"handlingStrategy":"validation","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"f4178619acd0d47ea1f76a2025c42962c6d6638c","analyzedAt":"2026-08-20T19:29:52.058Z","contentChangedAt":"2026-08-20T19:29:52.058Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}