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HTTP/2 large request body can fail with negative flow-control window

Status: Open.

#1082 In encode/httpcore;

· ShivamB25 opened on May 11, 2026

Add optional HTTP/2 PING keepalive to prevent idle connection timeouts

Status: Open.

#1080 In encode/httpcore;

· balaji-g opened on Apr 30, 2026

When using httpx in a sync setting, we noticed that host names with trailing dots such as, myhost.mycompany.internal. (to mark them as fully qualified in the dns) were failing with

Status: Open.

#1063 In encode/httpcore;

· rjduffner opened on Mar 9, 2026

Very slow when sending large amounts of data using httpx.Client Post, either with multi-threading or a single thread

Status: Open.

#1029 In encode/httpcore;

· xiexianbin opened on Aug 31, 2025

Container resets/crashes when HTTP request reaches receive_response_headers.started in httpcore.http11 logs despite using timeouts and connection pooling

Status: Open.

#1026 In encode/httpcore;

· Mahdi-Ba opened on Aug 6, 2025

Exceptions not handled properly in the proxy's AsyncTunnelHTTPConnection leading to the leaks and pool starvation

Status: Open.

#1023 In encode/httpcore;

· janosik47 opened on Jul 26, 2025

Deadlock: Stream Synchronization Issue Between httpcore and h2

Status: Open.

#1022 In encode/httpcore;

· fcourtial opened on Jul 22, 2025

Timeouts are not applied during socks5 initialization.

Status: Open.

#1015 In encode/httpcore;

· Brranton opened on Jun 6, 2025