std.http.Client blocks forever with larger payloads on HTTPS requests #25015
Description
Zig Version
0.16.0-dev.27+83f773fc6
Steps to Reproduce and Observed Behavior
Large payloads for std.http.Client.fetch seem to block forever under HTTPS connections. Increasing write_buffer_size in http.Client workarounds it.
How to reproduce:
const std = @import("std");
const Client = std.http.Client;
pub fn main() !void {
const alloc = std.heap.page_allocator;
var allocating = std.Io.Writer.Allocating.init(alloc);
defer allocating.deinit();
const opts: Client.FetchOptions = .{
.method = .POST,
.location = .{ .url = "https://httpbin.org/post" },
.payload = "631df10a8621493a1f71ce5e068583395846480e0f127f1c9ab46f6cbad83829" ** 64,
.response_writer = &allocating.writer,
};
var client: Client = .{ .allocator = alloc };
defer client.deinit();
_ = try client.fetch(opts);
std.debug.print("{s}\n", .{allocating.written()});
}Workaround by increasing write_buffer_size:
const std = @import("std");
const Client = std.http.Client;
pub fn main() !void {
const alloc = std.heap.page_allocator;
var allocating = std.Io.Writer.Allocating.init(alloc);
defer allocating.deinit();
const opts: Client.FetchOptions = .{
.method = .POST,
.location = .{ .url = "https://httpbin.org/post" },
.payload = "631df10a8621493a1f71ce5e068583395846480e0f127f1c9ab46f6cbad83829" ** 64,
.response_writer = &allocating.writer,
};
var client: Client = .{ .allocator = alloc, .write_buffer_size = 8192 };
defer client.deinit();
_ = try client.fetch(opts);
std.debug.print("{s}\n", .{allocating.written()});
}Changing url to http:// instead of https:// works as well.
Expected Behavior
The post request gets sent without blocking forever and without requiring increasing the write_buffer_size.