How To Upload To Instagram From Computer Been building a chat widget on htmx 4 (four-dev) with hx-sse and hit a fun one: when you open a conversation with someone new, the whole widget gets swapped (old panel out, new panel in, both carrying hx-sse:connect to the same URL) — and in Firefox, the first message you send into that fresh conversation just... never shows up. It's in the database, it comes back on the stream, but the log stays empty until you hit F5. Chrome is fine. Took me an evening of instrumenting both ends to figure out why, and the root cause is in the extension's teardown. Our New Blog
News Website Container Page cleanup() does this: Reading Stories Online
connection.abortController?.abort(); connection.reader?.cancel?.();
Example For Articles which looks right, except the initial connection is created with abortController: null (hx-sse.js, ~L125 on four-dev) — only reconnect fetches ever get a real controller (~L211). The initial response came from core's fetch, and core's controller is sitting right there on the ctx (ctx.request.abort / ctx.request.signal), but it's never wired up. So tearing down a connection that never reconnected cancels the body reader and nothing else. Design New Product Slide
Motivational Social Media Posts Two things fall out of that: Pre-Launch Clothing Brand Post Ideas
- The server never finds out the client left.
reader.cancel() stops consumption, but at least in Firefox the HTTP transaction stays open — I watched my server-side stream handlers keep running (and "sending") for minutes after their element was gone from the DOM. One leaked stream per swap. - This is the part that actually broke my app: in Firefox that cancelled-but-not-aborted transaction still counts as a busy connection, and Firefox schedules the replacement element's GET to the same URL behind it. In my traces the new stream's request sat unsent for 3+ seconds and only got dispatched when some unrelated request to the same host completed and freed a slot. Anything published in that window is gone for good — SSE has no backlog and a first connection has no
Last-Event-ID to replay from. Hence the vanishing first message: the POST wins the race against a connect that hasn't even left the browser yet. Chrome doesn't hit any of this because its reader.cancel() actually kills the transaction.
I Just Report The News GIF Fix is one line — hand the initial connection core's controller instead of null: Rounded Edge Business Cards
// in handleSSEResponse(ctx) abortController: { abort: ctx.request.abort, signal: ctx.request.signal },Packaging Design Books Keeping signal on the shim matters, because the streaming loop's catch checks connection.abortController?.signal?.aborted to tell teardown apart from a real network error — abort-only and you get a spurious htmx:sse:error on every cleanup. Reconnects overwrite the field with a real controller like before, so nothing else changes. New Product Announcement Email Template
Blog Post Website Examples I've been running this patch on my vendored copy and it fixes both the leak and the Firefox starvation. Happy to send a PR if you want it. Poster Design For Product
How To Upload To Instagram From Computer Been building a chat widget on htmx 4 (four-dev) with hx-sse and hit a fun one: when you open a conversation with someone new, the whole widget gets swapped (old panel out, new panel in, both carrying
hx-sse:connectto the same URL) — and in Firefox, the first message you send into that fresh conversation just... never shows up. It's in the database, it comes back on the stream, but the log stays empty until you hit F5. Chrome is fine. Took me an evening of instrumenting both ends to figure out why, and the root cause is in the extension's teardown. Our New BlogNews Website Container Page
cleanup()does this: Reading Stories OnlineExample For Articles which looks right, except the initial connection is created with
abortController: null(hx-sse.js, ~L125 on four-dev) — only reconnect fetches ever get a real controller (~L211). The initial response came from core's fetch, and core's controller is sitting right there on the ctx (ctx.request.abort/ctx.request.signal), but it's never wired up. So tearing down a connection that never reconnected cancels the body reader and nothing else. Design New Product SlideMotivational Social Media Posts Two things fall out of that: Pre-Launch Clothing Brand Post Ideas
reader.cancel()stops consumption, but at least in Firefox the HTTP transaction stays open — I watched my server-side stream handlers keep running (and "sending") for minutes after their element was gone from the DOM. One leaked stream per swap.Last-Event-IDto replay from. Hence the vanishing first message: the POST wins the race against a connect that hasn't even left the browser yet. Chrome doesn't hit any of this because itsreader.cancel()actually kills the transaction.I Just Report The News GIF Fix is one line — hand the initial connection core's controller instead of null: Rounded Edge Business Cards
Packaging Design Books Keeping
signalon the shim matters, because the streaming loop's catch checksconnection.abortController?.signal?.abortedto tell teardown apart from a real network error — abort-only and you get a spurioushtmx:sse:erroron every cleanup. Reconnects overwrite the field with a real controller like before, so nothing else changes. New Product Announcement Email TemplateBlog Post Website Examples I've been running this patch on my vendored copy and it fixes both the leak and the Firefox starvation. Happy to send a PR if you want it. Poster Design For Product