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fix(fetch): send bot-identifying UA on reddit .json API to bypass browser UA block
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This commit is contained in:
Valerio 2026-04-23 15:17:04 +02:00
parent 866fa88aa0
commit 966981bc42
1 changed files with 12 additions and 5 deletions
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17
crates/webclaw-fetch/src/client.rs
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@ -275,14 +275,21 @@ impl FetchClient {
// client IPs, but appending `.json` returns the post + comment tree
// publicly. `parse_reddit_json` in downstream code knows how to read
// the result; here we just do the URL swap at the fetch layer.
if crate::reddit::is_reddit_url(url) {
if crate::reddit::is_reddit_url(url) && !url.ends_with(".json") {
let json_url = crate::reddit::json_url(url);
if let Ok(resp) = self.fetch(&json_url).await
// Reddit's public .json API serves JSON to identifiable bot
// User-Agents and blocks browser UAs with a verification wall.
// Override our Chrome-profile UA for this specific call.
let ua = concat!(
"Webclaw/",
env!("CARGO_PKG_VERSION"),
" (+https://webclaw.io)"
);
if let Ok(resp) = self
.fetch_with_headers(&json_url, &[("user-agent", ua)])
.await
&& resp.status == 200
{
// Reddit will serve an HTML verification page at the .json
// URL too when the IP is flagged. Only return if the body
// actually starts with a JSON payload.
let first = resp.html.trim_start().as_bytes().first().copied();
if matches!(first, Some(b'{') | Some(b'[')) {
return Ok(resp);