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35 lines
1.4 KiB
Markdown
35 lines
1.4 KiB
Markdown
---
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title: "C08. POST a File as Raw Binary"
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order: 8
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status: "draft"
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---
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Sometimes you want to send a file's contents as the request body directly — no multipart wrapping. This is common for S3-compatible APIs or endpoints that take raw image data. For this, use `make_file_body()`.
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## Basic usage
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```cpp
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httplib::Client cli("https://storage.example.com");
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auto [size, provider] = httplib::make_file_body("backup.tar.gz");
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if (size == 0) {
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std::cerr << "Failed to open file" << std::endl;
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return 1;
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}
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auto res = cli.Put("/bucket/backup.tar.gz", size,
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provider, "application/gzip");
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```
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`make_file_body()` returns a pair of file size and a `ContentProvider`. Pass them to `Post()` or `Put()` and the file contents flow straight into the request body.
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The `ContentProvider` reads the file in chunks, so even huge files never sit fully in memory.
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## When the file can't be opened
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If the file can't be opened, `make_file_body()` returns `size` as `0` and `provider` as an empty function object. Sending that would produce garbage — always check `size` first.
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> **Warning:** `make_file_body()` needs to fix the Content-Length up front, so it reads the file size ahead of time. If the file size might change mid-upload, this API isn't the right fit.
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> To send the file as multipart form data instead, see [C07. Upload a file as multipart form data](../c07-multipart-upload).
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