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51 lines
1.7 KiB
Markdown
51 lines
1.7 KiB
Markdown
---
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title: "C12. Set Timeouts"
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order: 12
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status: "draft"
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---
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The client has three kinds of timeouts, each set independently.
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| Kind | API | Default | Meaning |
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| --- | --- | --- | --- |
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| Connection | `set_connection_timeout` | 300s | Time to wait for the TCP connection to establish |
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| Read | `set_read_timeout` | 300s | Time to wait for a single `recv` when receiving the response |
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| Write | `set_write_timeout` | 5s | Time to wait for a single `send` when sending the request |
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## Basic usage
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```cpp
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httplib::Client cli("http://localhost:8080");
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cli.set_connection_timeout(5, 0); // 5 seconds
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cli.set_read_timeout(10, 0); // 10 seconds
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cli.set_write_timeout(10, 0); // 10 seconds
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auto res = cli.Get("/api/data");
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```
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Pass seconds and microseconds as two arguments. If you don't need the sub-second part, you can omit the second argument.
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## Use `std::chrono`
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There's also an overload that takes a `std::chrono` duration directly. It's easier to read — recommended.
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```cpp
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using namespace std::chrono_literals;
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cli.set_connection_timeout(5s);
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cli.set_read_timeout(10s);
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cli.set_write_timeout(500ms);
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```
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## Watch out for the long 300s default
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Connection and read timeouts default to **300 seconds (5 minutes)**. If the server hangs, you'll be waiting five minutes by default. Shorter values are usually a better idea.
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```cpp
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cli.set_connection_timeout(3s);
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cli.set_read_timeout(10s);
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```
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> **Warning:** The read timeout covers a single receive call — not the whole request. If data keeps trickling in during a large download, the request can take half an hour without ever hitting the timeout. To cap the total request time, use C13. Set an Overall Timeout.
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