Why does Back Button download instead of using cache?

MilesAhead

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I've seen this on a bunch of browsers. You hit the Back Button, and it downloads the page instead of just reading it from cache!! I mean, I was just there 1 second ago! What's going to change?

What good is having cache if the Back Button is going to do that?
Makes no sense to me.

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My Computer My Computer

Computer Manufacturer/Model Number
HP Media Center
OS
Windows 7 32 bit
CPU
AMD 5200+ dual core
Memory
2 GB
Graphics Card(s)
NVidia GeForce 6150SE 128 MB
Monitor(s) Displays
CRT
Screen Resolution
1280x1024
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500 GB Sata internal :

SIIG USB 3.0 docking stations w/WD Caviar Black 6 Gb/s drives
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PS/2
Mouse
PS/2 Wheel Mouse
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SIIG USB 3.0 PCIexpress card.
I'm pretty sure it only uses the cache when in off-line mode.
 

My Computer My Computer

Computer Manufacturer/Model Number
Apple Macbook Pro (April 2009)
OS
W7 Ult. x64 | OS X
CPU
Intel Mobile Core 2 Duo 2.93Ghz [T9800 Penryn]
Motherboard
NVIDIA nForce 730i Rev. B1 [Mac-F2268EC8 (U2E1)]
Memory
4096MB Samsung DDR3 Dual Channel [PC3-8500F 1066Mhz]
Graphics Card(s)
NVIDIA GeForce 9600M GT 512MB [G96M Rev. C1]
Sound Card
SB X-Fi Surround 5.1 USB | Onboard Realtek (Disabled)
Monitor(s) Displays
Acer x223wbd 22" | Apple Anti-Glare 17" (Disabled)
Screen Resolution
{Current} 1440x900 {Acer} 1680x1050 {Apple} 1920x1200
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{Internal}
Seagate Momentus 320GB 2.5" 7200RPM [ST9320421AS]

{Externals}
LaCie 320GB USB 2.0 HDD [301284UR]
LaCie 750GB USB 2.0 FW400 eSATA HDD [301314U]
LaCie 1TB USB 2.0 HDD [301304UR]
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Magsafe
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Aluminum/Unibody (MBP52)
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2 x 6000 RPM Fans
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Logitech G-15v2 [PN 920-000379]
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Logitech G-9 [PN 910-000338]
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12Mbps/2.5Mbps w/ 24Mbps Speed Boost [Comcast]
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Logitech X-540 Speakers [PN 970223-0122]
Sennheiser PC-151 Headset
The question is why? Seems self-defeating to me.
 

My Computer My Computer

Computer Manufacturer/Model Number
HP Media Center
OS
Windows 7 32 bit
CPU
AMD 5200+ dual core
Memory
2 GB
Graphics Card(s)
NVidia GeForce 6150SE 128 MB
Monitor(s) Displays
CRT
Screen Resolution
1280x1024
Hard Drives
500 GB Sata internal :

SIIG USB 3.0 docking stations w/WD Caviar Black 6 Gb/s drives
Keyboard
PS/2
Mouse
PS/2 Wheel Mouse
Other Info
SIIG USB 3.0 PCIexpress card.
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