Download file using partial download (HTTP) in python

Download file using partial download (HTTP) in python

To perform a partial download of a file over HTTP in Python, you can use the requests library to send a HTTP GET request with the Range header. The Range header specifies the byte range you want to retrieve from the file. Here's an example:

import requests

def partial_download(url, start_byte, end_byte=None):
    headers = {}

    if end_byte:
        headers['Range'] = f'bytes={start_byte}-{end_byte}'
    else:
        headers['Range'] = f'bytes={start_byte}-'

    response = requests.get(url, headers=headers, stream=True)

    if response.status_code == 206:  # Partial Content
        return response.content
    else:
        raise Exception(f"Failed to download partial content. Status code: {response.status_code}")

url = 'https://example.com/large-file.zip'  # Replace with the URL of the file you want to download
start_byte = 0  # Start byte of the range
end_byte = 99999  # End byte of the range (optional)

try:
    partial_data = partial_download(url, start_byte, end_byte)
    with open('partial_download.zip', 'wb') as f:
        f.write(partial_data)
    print("Partial download completed successfully.")
except Exception as e:
    print(f"Error: {e}")

In this example:

  1. We define a partial_download function that takes a URL, a start byte, and an optional end byte as parameters. The function sends an HTTP GET request with the Range header to specify the byte range of the file to download.

  2. The response is checked for a status code of 206, which indicates a successful partial content response.

  3. If the download is successful, the partial content is saved to a local file.

Make sure to replace the url variable with the URL of the file you want to download, and adjust the start_byte and end_byte values to specify the desired byte range. The end_byte is optional; if omitted, it will download from the start_byte to the end of the file.

Examples

  1. "Python HTTP partial download example" Description: This query seeks examples demonstrating how to perform partial downloads of files using HTTP in Python. The code below showcases a simple implementation of this functionality using the requests library.

    import requests

url = 'http://example.com/large_file.zip'
headers = {'Range': 'bytes=0-99999'}

response = requests.get(url, headers=headers)

with open('partial_download.zip', 'wb') as f:
    f.write(response.content)

    This code snippet requests the first 100,000 bytes of a file hosted at the specified URL and saves it as 'partial_download.zip'.

  2. "Python HTTP partial download library" Description: Users looking for existing libraries or modules specifically designed for performing partial downloads over HTTP in Python might use this query. The following code snippet demonstrates how to achieve partial downloads using the urllib.request module.

    import urllib.request

url = 'http://example.com/large_file.zip'
req = urllib.request.Request(url, headers={'Range': 'bytes=0-99999'})
response = urllib.request.urlopen(req)

with open('partial_download.zip', 'wb') as f:
    f.write(response.read())

    This code snippet utilizes the urllib.request module to request the first 100,000 bytes of the file and saves it as 'partial_download.zip'.

  3. "Python HTTP range request example" Description: This query aims to find examples illustrating how to make HTTP range requests in Python. The code below demonstrates how to use the http.client module for partial downloads.

    import http.client

conn = http.client.HTTPConnection("example.com")
conn.request("GET", "/large_file.zip", headers={'Range': 'bytes=0-99999'})
response = conn.getresponse()

with open('partial_download.zip', 'wb') as f:
    f.write(response.read())

    This code snippet establishes an HTTP connection and sends a range request to retrieve the first 100,000 bytes of the file.

  4. "Python partial download with requests" Description: Users interested in utilizing the requests library for performing partial downloads in Python might use this query. The code below demonstrates how to achieve this using the requests library.

    import requests

url = 'http://example.com/large_file.zip'
headers = {'Range': 'bytes=0-99999'}

response = requests.get(url, headers=headers)

with open('partial_download.zip', 'wb') as f:
    f.write(response.content)

    This code snippet utilizes the requests library to make a partial download request and save the response content as 'partial_download.zip'.

  5. "Python HTTP partial content download" Description: This query targets resources illustrating how to download partial content over HTTP in Python. The code below demonstrates how to achieve this using the requests library.

    import requests

url = 'http://example.com/large_file.zip'
headers = {'Range': 'bytes=0-99999'}

response = requests.get(url, headers=headers)

with open('partial_download.zip', 'wb') as f:
    f.write(response.content)

    This code snippet utilizes the requests library to fetch a specific range of bytes from the file and save it as 'partial_download.zip'.

  6. "Python download large file in chunks" Description: This query seeks information on downloading large files in smaller chunks in Python. The following code demonstrates how to download a file in chunks using the requests library.

    import requests

url = 'http://example.com/large_file.zip'
chunk_size = 1024

with requests.get(url, stream=True) as r:
    with open('large_file.zip', 'wb') as f:
        for chunk in r.iter_content(chunk_size=chunk_size):
            if chunk:
                f.write(chunk)

    This code downloads a large file in chunks of 1024 bytes and saves it as 'large_file.zip'.

  7. "Python download file from URL" Description: This query looks for examples of how to download files from a URL in Python. The following code demonstrates a simple method using the requests library.

    import requests

url = 'http://example.com/large_file.zip'

response = requests.get(url)

with open('large_file.zip', 'wb') as f:
    f.write(response.content)

    This code snippet retrieves the file from the specified URL and saves it as 'large_file.zip'.

  8. "Python HTTP range header example" Description: This query aims to find examples illustrating how to use the Range header in HTTP requests in Python. The code below demonstrates how to make a range request using the requests library.

    import requests

url = 'http://example.com/large_file.zip'
headers = {'Range': 'bytes=0-99999'}

response = requests.get(url, headers=headers)

with open('partial_download.zip', 'wb') as f:
    f.write(response.content)

    This code snippet utilizes the Range header to request the first 100,000 bytes of the file.

  9. "Python HTTP partial download with progress" Description: Users looking for examples of partial downloads with progress tracking in Python might use this query. The following code demonstrates how to achieve this using the requests library.

    import requests
import sys

url = 'http://example.com/large_file.zip'
chunk_size = 1024

with requests.get(url, stream=True) as r:
    total_size = int(r.headers.get('content-length', 0))
    with open('partial_download.zip', 'wb') as f:
        for chunk in r.iter_content(chunk_size=chunk_size):
            if chunk:
                f.write(chunk)
                downloaded = len(chunk) * chunk_size
                progress = min(downloaded, total_size) / total_size * 100
                sys.stdout.write('\rProgress: %.2f%%' % progress)
                sys.stdout.flush()

    This code downloads a file in chunks and displays the download progress as a percentage.

  10. "Python HTTP partial download resume" Description: This query looks for examples demonstrating how to resume partial downloads over HTTP in Python. The code below showcases how to resume a partial download using the requests library.

    import requests

url = 'http://example.com/large_file.zip'
headers = {'Range': 'bytes=100000-'}

response = requests.get(url, headers=headers)

with open('partial_download_resume.zip', 'ab') as f:
    f.write(response.content)

    This code snippet resumes a partial download from byte 100,000 onwards and appends the content to an existing file named 'partial_download_resume.zip'.

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